Basicaly you have 2 mods in your mod folder wich are named differently but are the same, try going in you mod folder and deleting MercuriusUpdater-1.12.2.jar
I don't have a mod called MercuriusUpdater-1.12.2.jar. I even took all of my mods out of the mod folder one by one, and it still crashes. Here is a list of the mods I have: inventorypets-1.12-1.4.9.9 jar, Neat-Mod-1.12.jar, defiledlands-1.12.2-1.0.0.jar, fencejumper-1.12-1.0.1.jar, MCA-1.12.x-5.3.1-universal.jar, mapwriter-2-Mod-1.12.1.jar, Fast-Leave-Decay-Mod-1.12.1.jar, astikoor-1.0.0.jar, jei_1.10.2-3.14.7.417.jar, RadixCore-1.12.2.jar,
BiomesOPlenty-1.12.2-7.0.1.universal.jar, MrCrayfishs-Device-1.12.2.jar, Backpacks-Mod-by-Brad-1.12.2.jar, and
Could you ask her how then possibly tell me? Im having the same issue but my brother couldnt figure it out so im kinda all out of options. If you could, that would be great. If not thats fine as well.
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[17:17:15] [main/INFO] [FML/]: Forge Mod Loader version 14.23.0.2493 for Minecraft 1.12.2 loading
[17:17:15] [main/INFO] [FML/]: Java is Java HotSpot(TM) 64-Bit Server VM, version 1.8.0_74, running on Mac OS X:x86_64:10.12.3, installed at /Applications/Minecraft.app/Contents/runtime/jre-x64/1.8.0_74
[17:17:15] [main/DEBUG] [FML/]: Java classpath at launch is:
[17:17:15] [main/DEBUG] [FML/]: /Users/Mega/Library/Application Support/minecraft/libraries/net/minecraftforge/forge/1.12.2-14.23.0.2493/forge-1.12.2-14.23.0.2493.jar
[17:17:15] [main/DEBUG] [FML/]: /Users/Mega/Library/Application Support/minecraft/libraries/net/minecraft/launchwrapper/1.12/launchwrapper-1.12.jar
[17:17:15] [main/DEBUG] [FML/]: /Users/Mega/Library/Application Support/minecraft/libraries/org/ow2/asm/asm-all/5.2/asm-all-5.2.jar
[17:17:15] [main/DEBUG] [FML/]: /Users/Mega/Library/Application Support/minecraft/libraries/jline/jline/2.13/jline-2.13.jar
[17:17:15] [main/DEBUG] [FML/]: /Users/Mega/Library/Application Support/minecraft/libraries/com/typesafe/akka/akka-actor_2.11/2.3.3/akka-actor_2.11-2.3.3.jar
[17:17:15] [main/DEBUG] [FML/]: /Users/Mega/Library/Application Support/minecraft/libraries/com/typesafe/config/1.2.1/config-1.2.1.jar
[17:17:15] [main/DEBUG] [FML/]: /Users/Mega/Library/Application Support/minecraft/libraries/org/scala-lang/scala-actors-migration_2.11/1.1.0/scala-actors-migration_2.11-1.1.0.jar
[17:17:15] [main/DEBUG] [FML/]: /Users/Mega/Library/Application Support/minecraft/libraries/org/scala-lang/scala-compiler/2.11.1/scala-compiler-2.11.1.jar
[17:17:15] [main/DEBUG] [FML/]: /Users/Mega/Library/Application Support/minecraft/libraries/org/scala-lang/plugins/scala-continuations-library_2.11/1.0.2/scala-continuations-library_2.11-1.0.2.jar
[17:17:15] [main/DEBUG] [FML/]: /Users/Mega/Library/Application Support/minecraft/libraries/org/scala-lang/plugins/scala-continuations-plugin_2.11.1/1.0.2/scala-continuations-plugin_2.11.1-1.0.2.jar
[17:17:15] [main/DEBUG] [FML/]: /Users/Mega/Library/Application Support/minecraft/libraries/org/scala-lang/scala-library/2.11.1/scala-library-2.11.1.jar
[17:17:15] [main/DEBUG] [FML/]: /Users/Mega/Library/Application Support/minecraft/libraries/org/scala-lang/scala-parser-combinators_2.11/1.0.1/scala-parser-combinators_2.11-1.0.1.jar
[17:17:15] [main/DEBUG] [FML/]: /Users/Mega/Library/Application Support/minecraft/libraries/org/scala-lang/scala-reflect/2.11.1/scala-reflect-2.11.1.jar
[17:17:15] [main/DEBUG] [FML/]: /Users/Mega/Library/Application Support/minecraft/libraries/org/scala-lang/scala-swing_2.11/1.0.1/scala-swing_2.11-1.0.1.jar
[17:17:15] [main/DEBUG] [FML/]: /Users/Mega/Library/Application Support/minecraft/libraries/org/scala-lang/scala-xml_2.11/1.0.2/scala-xml_2.11-1.0.2.jar
[17:17:15] [main/DEBUG] [FML/]: /Users/Mega/Library/Application Support/minecraft/libraries/lzma/lzma/0.0.1/lzma-0.0.1.jar
[17:17:15] [main/DEBUG] [FML/]: /Users/Mega/Library/Application Support/minecraft/libraries/net/sf/jopt-simple/jopt-simple/5.0.3/jopt-simple-5.0.3.jar
[17:17:15] [main/DEBUG] [FML/]: /Users/Mega/Library/Application Support/minecraft/libraries/java3d/vecmath/1.5.2/vecmath-1.5.2.jar
[17:17:15] [main/DEBUG] [FML/]: /Users/Mega/Library/Application Support/minecraft/libraries/net/sf/trove4j/trove4j/3.0.3/trove4j-3.0.3.jar
[17:17:15] [main/DEBUG] [FML/]: /Users/Mega/Library/Application Support/minecraft/libraries/net/minecraftforge/MercuriusUpdater/1.12.2/MercuriusUpdater-1.12.2.jar
[17:17:15] [main/DEBUG] [FML/]: /Users/Mega/Library/Application Support/minecraft/libraries/com/mojang/patchy/1.1/patchy-1.1.jar
[17:17:15] [main/DEBUG] [FML/]: /Users/Mega/Library/Application Support/minecraft/libraries/oshi-project/oshi-core/1.1/oshi-core-1.1.jar
[17:17:15] [main/DEBUG] [FML/]: /Users/Mega/Library/Application Support/minecraft/libraries/net/java/dev/jna/jna/4.4.0/jna-4.4.0.jar
[17:17:15] [main/DEBUG] [FML/]: /Users/Mega/Library/Application Support/minecraft/libraries/net/java/dev/jna/platform/3.4.0/platform-3.4.0.jar
[17:17:15] [main/DEBUG] [FML/]: /Users/Mega/Library/Application Support/minecraft/libraries/com/ibm/icu/icu4j-core-mojang/51.2/icu4j-core-mojang-51.2.jar
[17:17:15] [main/DEBUG] [FML/]: /Users/Mega/Library/Application Support/minecraft/libraries/net/sf/jopt-simple/jopt-simple/5.0.3/jopt-simple-5.0.3.jar
[17:17:15] [main/DEBUG] [FML/]: /Users/Mega/Library/Application Support/minecraft/libraries/com/paulscode/codecjorbis/20101023/codecjorbis-20101023.jar
[17:17:15] [main/DEBUG] [FML/]: /Users/Mega/Library/Application Support/minecraft/libraries/com/paulscode/codecwav/20101023/codecwav-20101023.jar
[17:17:15] [main/DEBUG] [FML/]: /Users/Mega/Library/Application Support/minecraft/libraries/com/paulscode/libraryjavasound/20101123/libraryjavasound-20101123.jar
[17:17:15] [main/DEBUG] [FML/]: /Users/Mega/Library/Application Support/minecraft/libraries/com/paulscode/librarylwjglopenal/20100824/librarylwjglopenal-20100824.jar
[17:17:15] [main/DEBUG] [FML/]: /Users/Mega/Library/Application Support/minecraft/libraries/com/paulscode/soundsystem/20120107/soundsystem-20120107.jar
[17:17:15] [main/DEBUG] [FML/]: /Users/Mega/Library/Application Support/minecraft/libraries/io/netty/netty-all/4.1.9.Final/netty-all-4.1.9.Final.jar
[17:17:15] [main/DEBUG] [FML/]: /Users/Mega/Library/Application Support/minecraft/libraries/com/google/guava/guava/21.0/guava-21.0.jar
[17:17:15] [main/DEBUG] [FML/]: /Users/Mega/Library/Application Support/minecraft/libraries/org/apache/commons/commons-lang3/3.5/commons-lang3-3.5.jar
[17:17:15] [main/DEBUG] [FML/]: /Users/Mega/Library/Application Support/minecraft/libraries/commons-io/commons-io/2.5/commons-io-2.5.jar
[17:17:15] [main/DEBUG] [FML/]: /Users/Mega/Library/Application Support/minecraft/libraries/commons-codec/commons-codec/1.10/commons-codec-1.10.jar
[17:17:15] [main/DEBUG] [FML/]: /Users/Mega/Library/Application Support/minecraft/libraries/net/java/jinput/jinput/2.0.5/jinput-2.0.5.jar
[17:17:15] [main/DEBUG] [FML/]: /Users/Mega/Library/Application Support/minecraft/libraries/net/java/jutils/jutils/1.0.0/jutils-1.0.0.jar
[17:17:15] [main/DEBUG] [FML/]: /Users/Mega/Library/Application Support/minecraft/libraries/com/google/code/gson/gson/2.8.0/gson-2.8.0.jar
[17:17:15] [main/DEBUG] [FML/]: /Users/Mega/Library/Application Support/minecraft/libraries/com/mojang/authlib/1.5.25/authlib-1.5.25.jar
[17:17:15] [main/DEBUG] [FML/]: /Users/Mega/Library/Application Support/minecraft/libraries/com/mojang/realms/1.10.17/realms-1.10.17.jar
[17:17:15] [main/DEBUG] [FML/]: /Users/Mega/Library/Application Support/minecraft/libraries/org/apache/commons/commons-compress/1.8.1/commons-compress-1.8.1.jar
[17:17:15] [main/DEBUG] [FML/]: /Users/Mega/Library/Application Support/minecraft/libraries/org/apache/httpcomponents/httpclient/4.3.3/httpclient-4.3.3.jar
[17:17:15] [main/DEBUG] [FML/]: /Users/Mega/Library/Application Support/minecraft/libraries/commons-logging/commons-logging/1.1.3/commons-logging-1.1.3.jar
[17:17:15] [main/DEBUG] [FML/]: /Users/Mega/Library/Application Support/minecraft/libraries/org/apache/httpcomponents/httpcore/4.3.2/httpcore-4.3.2.jar
[17:17:15] [main/DEBUG] [FML/]: /Users/Mega/Library/Application Support/minecraft/libraries/it/unimi/dsi/fastutil/7.1.0/fastutil-7.1.0.jar
[17:17:15] [main/DEBUG] [FML/]: /Users/Mega/Library/Application Support/minecraft/libraries/org/apache/logging/log4j/log4j-api/2.8.1/log4j-api-2.8.1.jar
[17:17:15] [main/DEBUG] [FML/]: /Users/Mega/Library/Application Support/minecraft/libraries/org/apache/logging/log4j/log4j-core/2.8.1/log4j-core-2.8.1.jar
[17:17:15] [main/DEBUG] [FML/]: /Users/Mega/Library/Application Support/minecraft/libraries/org/lwjgl/lwjgl/lwjgl/2.9.4-nightly-20150209/lwjgl-2.9.4-nightly-20150209.jar
[17:17:15] [main/DEBUG] [FML/]: /Users/Mega/Library/Application Support/minecraft/libraries/org/lwjgl/lwjgl/lwjgl_util/2.9.4-nightly-20150209/lwjgl_util-2.9.4-nightly-20150209.jar
[17:17:15] [main/DEBUG] [FML/]: /Users/Mega/Library/Application Support/minecraft/libraries/org/lwjgl/lwjgl/lwjgl/2.9.2-nightly-20140822/lwjgl-2.9.2-nightly-20140822.jar
[17:17:15] [main/DEBUG] [FML/]: /Users/Mega/Library/Application Support/minecraft/libraries/org/lwjgl/lwjgl/lwjgl_util/2.9.2-nightly-20140822/lwjgl_util-2.9.2-nightly-20140822.jar
[17:17:15] [main/DEBUG] [FML/]: /Users/Mega/Library/Application Support/minecraft/libraries/com/mojang/text2speech/1.10.3/text2speech-1.10.3.jar
[17:17:15] [main/DEBUG] [FML/]: /Users/Mega/Library/Application Support/minecraft/libraries/com/mojang/text2speech/1.10.3/text2speech-1.10.3.jar
[17:17:15] [main/DEBUG] [FML/]: /Users/Mega/Library/Application Support/minecraft/libraries/ca/weblite/java-objc-bridge/1.0.0/java-objc-bridge-1.0.0.jar
[17:17:15] [main/DEBUG] [FML/]: /Users/Mega/Library/Application Support/minecraft/versions/1.12.2/1.12.2.jar
[17:17:15] [main/DEBUG] [FML/]: Java library path at launch is:
[17:17:15] [main/DEBUG] [FML/]: /var/folders/jl/ht36bxhj0ld1rg42b13470140000gn/T/8520-717e-df28-8e14
[17:17:15] [main/DEBUG] [FML/]: Enabling runtime deobfuscation
[17:17:15] [main/DEBUG] [FML/]: Instantiating coremod class FMLCorePlugin
[17:17:15] [main/DEBUG] [FML/]: Found signing certificates for coremod FMLCorePlugin (net.minecraftforge.fml.relauncher.FMLCorePlugin)
[17:17:15] [main/DEBUG] [FML/]: Found certificate e3c3d50c7c986df74c645c0ac54639741c90a557
[17:17:15] [main/DEBUG] [FML/]: Added access transformer class net.minecraftforge.fml.common.asm.transformers.AccessTransformer to enqueued access transformers
[17:17:15] [main/DEBUG] [FML/]: Enqueued coremod FMLCorePlugin
[17:17:15] [main/DEBUG] [FML/]: Instantiating coremod class FMLForgePlugin
[17:17:15] [main/DEBUG] [FML/]: Found signing certificates for coremod FMLForgePlugin (net.minecraftforge.classloading.FMLForgePlugin)
[17:17:15] [main/DEBUG] [FML/]: Found certificate e3c3d50c7c986df74c645c0ac54639741c90a557
[17:17:15] [main/DEBUG] [FML/]: Enqueued coremod FMLForgePlugin
[17:17:15] [main/DEBUG] [FML/]: All fundamental core mods are successfully located
[17:17:16] [main/DEBUG] [FML/]: Attempting to load commandline specified mods, relative to /Users/Mega/Library/Application Support/minecraft
[17:17:16] [main/DEBUG] [FML/]: Discovering coremods
[17:17:16] [main/DEBUG] [FML/]: Examining for coremod candidacy MercuriusUpdater-1.12.2-1.0.0.14.jar
[17:17:16] [main/DEBUG] [FML/]: Not found coremod data in MercuriusUpdater-1.12.2-1.0.0.14.jar
[17:17:16] [main/INFO] [LaunchWrapper/]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLInjectionAndSortingTweaker
[17:17:16] [main/INFO] [LaunchWrapper/]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLDeobfTweaker
[17:17:16] [main/INFO] [LaunchWrapper/]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLInjectionAndSortingTweaker
[17:17:16] [main/INFO] [LaunchWrapper/]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLInjectionAndSortingTweaker
[17:17:16] [main/INFO] [LaunchWrapper/]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper
[17:17:16] [main/DEBUG] [FML/]: Injecting coremod FMLCorePlugin \{net.minecraftforge.fml.relauncher.FMLCorePlugin\} class transformers
[17:17:16] [main/TRACE] [FML/]: Registering transformer net.minecraftforge.fml.common.asm.transformers.BlamingTransformer
[17:17:16] [main/TRACE] [FML/]: Registering transformer net.minecraftforge.fml.common.asm.transformers.SideTransformer
[17:17:16] [main/TRACE] [FML/]: Registering transformer net.minecraftforge.fml.common.asm.transformers.EventSubscriptionTransformer
[17:17:16] [main/TRACE] [FML/]: Registering transformer net.minecraftforge.fml.common.asm.transformers.EventSubscriberTransformer
[17:17:16] [main/DEBUG] [FML/]: Injection complete
[17:17:16] [main/DEBUG] [FML/]: Running coremod plugin for FMLCorePlugin \{net.minecraftforge.fml.relauncher.FMLCorePlugin\}
[17:17:16] [main/DEBUG] [FML/]: Running coremod plugin FMLCorePlugin
[17:17:17] [main/DEBUG] [FML/]: Injecting tracing printstreams for STDOUT/STDERR.
[17:17:17] [main/DEBUG] [FML/]: Read 1013 binary patches
[17:17:17] [main/DEBUG] [FML/]: Loading deobfuscation resource /deobfuscation_data-1.12.2.lzma with 36083 records
[17:17:19] [main/INFO] [FML/]: Found valid fingerprint for Minecraft Forge. Certificate fingerprint e3c3d50c7c986df74c645c0ac54639741c90a557
[17:17:19] [main/INFO] [FML/]: Found valid fingerprint for Minecraft. Certificate fingerprint cd99959656f753dc28d863b46769f7f8fbaefcfc
[17:17:19] [main/DEBUG] [FML/]: Coremod plugin class FMLCorePlugin run successfully
[17:17:19] [main/INFO] [LaunchWrapper/]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper
[17:17:19] [main/DEBUG] [FML/]: Injecting coremod FMLForgePlugin \{net.minecraftforge.classloading.FMLForgePlugin\} class transformers
[17:17:19] [main/DEBUG] [FML/]: Injection complete
[17:17:19] [main/DEBUG] [FML/]: Running coremod plugin for FMLForgePlugin \{net.minecraftforge.classloading.FMLForgePlugin\}
[17:17:19] [main/DEBUG] [FML/]: Running coremod plugin FMLForgePlugin
[17:17:19] [main/DEBUG] [FML/]: Coremod plugin class FMLForgePlugin run successfully
[17:17:19] [main/INFO] [LaunchWrapper/]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLDeobfTweaker
[17:17:19] [main/DEBUG] [FML/]: Loaded 208 rules from AccessTransformer config file forge_at.cfg
[17:17:19] [main/DEBUG] [FML/]: Validating minecraft
[17:17:20] [main/DEBUG] [FML/]: Minecraft validated, launching...
[17:17:20] [main/INFO] [LaunchWrapper/]: Loading tweak class name net.minecraftforge.fml.common.launcher.TerminalTweaker
[17:17:20] [main/INFO] [LaunchWrapper/]: Calling tweak class net.minecraftforge.fml.common.launcher.TerminalTweaker
[17:17:20] [main/INFO] [LaunchWrapper/]: Launching wrapped minecraft {net.minecraft.client.main.Main}
[17:17:30] [main/DEBUG] [FML/]: Creating vanilla freeze snapshot
[17:17:30] [main/DEBUG] [FML/]: Vanilla freeze snapshot created
[17:17:31] [main/DEBUG] [FML/]: Bar Finished: Loading Resource - LanguageManager took 0.002s
[17:17:32] [main/INFO] [FML/]: MinecraftForge v14.23.0.2493 Initialized
[17:17:32] [main/INFO] [FML/]: Starts to replace vanilla recipe ingredients with ore ingredients.
[17:17:32] [main/INFO] [FML/]: Replaced 1036 ore ingredients
[17:17:32] [main/DEBUG] [FML/]: File /Users/Mega/Library/Application Support/minecraft/config/injectedDependencies.json not found. No dependencies injected
[17:17:32] [main/DEBUG] [FML/]: Building injected Mod Containers [net.minecraftforge.fml.common.FMLContainer, net.minecraftforge.common.ForgeModContainer]
[17:17:32] [main/DEBUG] [FML/]: Attempting to load mods contained in the minecraft jar file and associated classes
[17:17:32] [main/DEBUG] [FML/]: Found a minecraft related file at /Users/Mega/Library/Application Support/minecraft/libraries/net/minecraftforge/forge/1.12.2-14.23.0.2493/forge-1.12.2-14.23.0.2493.jar, examining for mod candidates
[17:17:32] [main/TRACE] [FML/]: Skipping known library file /Users/Mega/Library/Application Support/minecraft/libraries/net/minecraft/launchwrapper/1.12/launchwrapper-1.12.jar
[17:17:32] [main/TRACE] [FML/]: Skipping known library file /Users/Mega/Library/Application Support/minecraft/libraries/org/ow2/asm/asm-all/5.2/asm-all-5.2.jar
[17:17:32] [main/TRACE] [FML/]: Skipping known library file /Users/Mega/Library/Application Support/minecraft/libraries/jline/jline/2.13/jline-2.13.jar
[17:17:32] [main/TRACE] [FML/]: Skipping known library file /Users/Mega/Library/Application Support/minecraft/libraries/com/typesafe/akka/akka-actor_2.11/2.3.3/akka-actor_2.11-2.3.3.jar
[17:17:32] [main/TRACE] [FML/]: Skipping known library file /Users/Mega/Library/Application Support/minecraft/libraries/com/typesafe/config/1.2.1/config-1.2.1.jar
[17:17:32] [main/TRACE] [FML/]: Skipping known library file /Users/Mega/Library/Application Support/minecraft/libraries/org/scala-lang/scala-actors-migration_2.11/1.1.0/scala-actors-migration_2.11-1.1.0.jar
[17:17:32] [main/TRACE] [FML/]: Skipping known library file /Users/Mega/Library/Application Support/minecraft/libraries/org/scala-lang/scala-compiler/2.11.1/scala-compiler-2.11.1.jar
[17:17:32] [main/TRACE] [FML/]: Skipping known library file /Users/Mega/Library/Application Support/minecraft/libraries/org/scala-lang/plugins/scala-continuations-library_2.11/1.0.2/scala-continuations-library_2.11-1.0.2.jar
[17:17:32] [main/TRACE] [FML/]: Skipping known library file /Users/Mega/Library/Application Support/minecraft/libraries/org/scala-lang/plugins/scala-continuations-plugin_2.11.1/1.0.2/scala-continuations-plugin_2.11.1-1.0.2.jar
[17:17:32] [main/TRACE] [FML/]: Skipping known library file /Users/Mega/Library/Application Support/minecraft/libraries/org/scala-lang/scala-library/2.11.1/scala-library-2.11.1.jar
[17:17:32] [main/TRACE] [FML/]: Skipping known library file /Users/Mega/Library/Application Support/minecraft/libraries/org/scala-lang/scala-parser-combinators_2.11/1.0.1/scala-parser-combinators_2.11-1.0.1.jar
[17:17:32] [main/TRACE] [FML/]: Skipping known library file /Users/Mega/Library/Application Support/minecraft/libraries/org/scala-lang/scala-reflect/2.11.1/scala-reflect-2.11.1.jar
[17:17:32] [main/TRACE] [FML/]: Skipping known library file /Users/Mega/Library/Application Support/minecraft/libraries/org/scala-lang/scala-swing_2.11/1.0.1/scala-swing_2.11-1.0.1.jar
[17:17:32] [main/TRACE] [FML/]: Skipping known library file /Users/Mega/Library/Application Support/minecraft/libraries/org/scala-lang/scala-xml_2.11/1.0.2/scala-xml_2.11-1.0.2.jar
[17:17:32] [main/TRACE] [FML/]: Skipping known library file /Users/Mega/Library/Application Support/minecraft/libraries/lzma/lzma/0.0.1/lzma-0.0.1.jar
[17:17:32] [main/TRACE] [FML/]: Skipping known library file /Users/Mega/Library/Application Support/minecraft/libraries/net/sf/jopt-simple/jopt-simple/5.0.3/jopt-simple-5.0.3.jar
[17:17:32] [main/TRACE] [FML/]: Skipping known library file /Users/Mega/Library/Application Support/minecraft/libraries/java3d/vecmath/1.5.2/vecmath-1.5.2.jar
[17:17:32] [main/TRACE] [FML/]: Skipping known library file /Users/Mega/Library/Application Support/minecraft/libraries/net/sf/trove4j/trove4j/3.0.3/trove4j-3.0.3.jar
[17:17:32] [main/DEBUG] [FML/]: Found a minecraft related file at /Users/Mega/Library/Application Support/minecraft/libraries/net/minecraftforge/MercuriusUpdater/1.12.2/MercuriusUpdater-1.12.2.jar, examining for mod candidates
[17:17:32] [main/DEBUG] [FML/]: Found a minecraft related file at /Users/Mega/Library/Application Support/minecraft/libraries/com/mojang/patchy/1.1/patchy-1.1.jar, examining for mod candidates
[17:17:32] [main/TRACE] [FML/]: Skipping known library file /Users/Mega/Library/Application Support/minecraft/libraries/oshi-project/oshi-core/1.1/oshi-core-1.1.jar
[17:17:32] [main/TRACE] [FML/]: Skipping known library file /Users/Mega/Library/Application Support/minecraft/libraries/net/java/dev/jna/jna/4.4.0/jna-4.4.0.jar
[17:17:32] [main/TRACE] [FML/]: Skipping known library file /Users/Mega/Library/Application Support/minecraft/libraries/net/java/dev/jna/platform/3.4.0/platform-3.4.0.jar
[17:17:32] [main/TRACE] [FML/]: Skipping known library file /Users/Mega/Library/Application Support/minecraft/libraries/com/ibm/icu/icu4j-core-mojang/51.2/icu4j-core-mojang-51.2.jar
[17:17:32] [main/TRACE] [FML/]: Skipping known library file /Users/Mega/Library/Application Support/minecraft/libraries/net/sf/jopt-simple/jopt-simple/5.0.3/jopt-simple-5.0.3.jar
[17:17:32] [main/TRACE] [FML/]: Skipping known library file /Users/Mega/Library/Application Support/minecraft/libraries/com/paulscode/codecjorbis/20101023/codecjorbis-20101023.jar
[17:17:32] [main/TRACE] [FML/]: Skipping known library file /Users/Mega/Library/Application Support/minecraft/libraries/com/paulscode/codecwav/20101023/codecwav-20101023.jar
[17:17:32] [main/TRACE] [FML/]: Skipping known library file /Users/Mega/Library/Application Support/minecraft/libraries/com/paulscode/libraryjavasound/20101123/libraryjavasound-20101123.jar
[17:17:32] [main/TRACE] [FML/]: Skipping known library file /Users/Mega/Library/Application Support/minecraft/libraries/com/paulscode/librarylwjglopenal/20100824/librarylwjglopenal-20100824.jar
[17:17:32] [main/TRACE] [FML/]: Skipping known library file /Users/Mega/Library/Application Support/minecraft/libraries/com/paulscode/soundsystem/20120107/soundsystem-20120107.jar
[17:17:32] [main/TRACE] [FML/]: Skipping known library file /Users/Mega/Library/Application Support/minecraft/libraries/io/netty/netty-all/4.1.9.Final/netty-all-4.1.9.Final.jar
[17:17:32] [main/TRACE] [FML/]: Skipping known library file /Users/Mega/Library/Application Support/minecraft/libraries/com/google/guava/guava/21.0/guava-21.0.jar
[17:17:32] [main/TRACE] [FML/]: Skipping known library file /Users/Mega/Library/Application Support/minecraft/libraries/org/apache/commons/commons-lang3/3.5/commons-lang3-3.5.jar
[17:17:32] [main/TRACE] [FML/]: Skipping known library file /Users/Mega/Library/Application Support/minecraft/libraries/commons-io/commons-io/2.5/commons-io-2.5.jar
[17:17:32] [main/TRACE] [FML/]: Skipping known library file /Users/Mega/Library/Application Support/minecraft/libraries/commons-codec/commons-codec/1.10/commons-codec-1.10.jar
[17:17:32] [main/TRACE] [FML/]: Skipping known library file /Users/Mega/Library/Application Support/minecraft/libraries/net/java/jinput/jinput/2.0.5/jinput-2.0.5.jar
[17:17:32] [main/TRACE] [FML/]: Skipping known library file /Users/Mega/Library/Application Support/minecraft/libraries/net/java/jutils/jutils/1.0.0/jutils-1.0.0.jar
[17:17:32] [main/TRACE] [FML/]: Skipping known library file /Users/Mega/Library/Application Support/minecraft/libraries/com/google/code/gson/gson/2.8.0/gson-2.8.0.jar
[17:17:32] [main/TRACE] [FML/]: Skipping known library file /Users/Mega/Library/Application Support/minecraft/libraries/com/mojang/authlib/1.5.25/authlib-1.5.25.jar
[17:17:32] [main/TRACE] [FML/]: Skipping known library file /Users/Mega/Library/Application Support/minecraft/libraries/com/mojang/realms/1.10.17/realms-1.10.17.jar
[17:17:32] [main/TRACE] [FML/]: Skipping known library file /Users/Mega/Library/Application Support/minecraft/libraries/org/apache/commons/commons-compress/1.8.1/commons-compress-1.8.1.jar
[17:17:32] [main/TRACE] [FML/]: Skipping known library file /Users/Mega/Library/Application Support/minecraft/libraries/org/apache/httpcomponents/httpclient/4.3.3/httpclient-4.3.3.jar
[17:17:32] [main/TRACE] [FML/]: Skipping known library file /Users/Mega/Library/Application Support/minecraft/libraries/commons-logging/commons-logging/1.1.3/commons-logging-1.1.3.jar
[17:17:32] [main/TRACE] [FML/]: Skipping known library file /Users/Mega/Library/Application Support/minecraft/libraries/org/apache/httpcomponents/httpcore/4.3.2/httpcore-4.3.2.jar
[17:17:32] [main/TRACE] [FML/]: Skipping known library file /Users/Mega/Library/Application Support/minecraft/libraries/it/unimi/dsi/fastutil/7.1.0/fastutil-7.1.0.jar
[17:17:32] [main/TRACE] [FML/]: Skipping known library file /Users/Mega/Library/Application Support/minecraft/libraries/org/apache/logging/log4j/log4j-api/2.8.1/log4j-api-2.8.1.jar
[17:17:32] [main/TRACE] [FML/]: Skipping known library file /Users/Mega/Library/Application Support/minecraft/libraries/org/apache/logging/log4j/log4j-core/2.8.1/log4j-core-2.8.1.jar
[17:17:32] [main/TRACE] [FML/]: Skipping known library file /Users/Mega/Library/Application Support/minecraft/libraries/org/lwjgl/lwjgl/lwjgl/2.9.4-nightly-20150209/lwjgl-2.9.4-nightly-20150209.jar
[17:17:32] [main/TRACE] [FML/]: Skipping known library file /Users/Mega/Library/Application Support/minecraft/libraries/org/lwjgl/lwjgl/lwjgl_util/2.9.4-nightly-20150209/lwjgl_util-2.9.4-nightly-20150209.jar
[17:17:32] [main/TRACE] [FML/]: Skipping known library file /Users/Mega/Library/Application Support/minecraft/libraries/org/lwjgl/lwjgl/lwjgl/2.9.2-nightly-20140822/lwjgl-2.9.2-nightly-20140822.jar
[17:17:32] [main/TRACE] [FML/]: Skipping known library file /Users/Mega/Library/Application Support/minecraft/libraries/org/lwjgl/lwjgl/lwjgl_util/2.9.2-nightly-20140822/lwjgl_util-2.9.2-nightly-20140822.jar
[17:17:32] [main/DEBUG] [FML/]: Found a minecraft related file at /Users/Mega/Library/Application Support/minecraft/libraries/com/mojang/text2speech/1.10.3/text2speech-1.10.3.jar, examining for mod candidates
[17:17:32] [main/DEBUG] [FML/]: Found a minecraft related file at /Users/Mega/Library/Application Support/minecraft/libraries/com/mojang/text2speech/1.10.3/text2speech-1.10.3.jar, examining for mod candidates
[17:17:32] [main/TRACE] [FML/]: Skipping already in list /Users/Mega/Library/Application Support/minecraft/libraries/com/mojang/text2speech/1.10.3/text2speech-1.10.3.jar
[17:17:32] [main/DEBUG] [FML/]: Found a minecraft related file at /Users/Mega/Library/Application Support/minecraft/libraries/ca/weblite/java-objc-bridge/1.0.0/java-objc-bridge-1.0.0.jar, examining for mod candidates
[17:17:32] [main/DEBUG] [FML/]: Found a minecraft related file at /Users/Mega/Library/Application Support/minecraft/versions/1.12.2/1.12.2.jar, examining for mod candidates
[17:17:32] [main/DEBUG] [FML/]: Minecraft jar mods loaded successfully
[17:17:32] [main/INFO] [FML/]: Found 0 mods from the command line. Injecting into mod discoverer
[17:17:32] [main/INFO] [FML/]: Searching /Users/Mega/Library/Application Support/minecraft/mods for mods
[17:17:32] [main/DEBUG] [FML/]: Ignoring unknown file .DS_Store in mods directory
[17:17:32] [main/DEBUG] [FML/]: Ignoring unknown file Mercurius.cfg in mods directory
[17:17:32] [main/DEBUG] [FML/]: Found a candidate zip or jar file MercuriusUpdater-1.12.2-1.0.0.14.jar
[17:17:32] [main/DEBUG] [FML/]: Examining file forge-1.12.2-14.23.0.2493.jar for potential mods
[17:17:32] [main/DEBUG] [FML/]: The mod container forge-1.12.2-14.23.0.2493.jar appears to be missing an mcmod.info file
[17:17:33] [main/DEBUG] [FML/]: Examining file MercuriusUpdater-1.12.2.jar for potential mods
[17:17:33] [main/TRACE] [FML/]: Located mcmod.info file in file MercuriusUpdater-1.12.2.jar
[17:17:33] [main/DEBUG] [FML/]: Identified a mod of type Lnet/minecraftforge/fml/common/Mod; (net.minecraftforge.mercurius.updater.MercuriusUpdaterMod) - loading
[17:17:33] [main/TRACE] [mercurius_updater/]: Parsed dependency info : [] [] []
[17:17:33] [main/INFO] [mercurius_updater/]: Mod mercurius_updater is missing the required element 'name'. Substituting mercurius_updater
[17:17:33] [main/DEBUG] [FML/]: Examining file patchy-1.1.jar for potential mods
[17:17:33] [main/DEBUG] [FML/]: The mod container patchy-1.1.jar appears to be missing an mcmod.info file
[17:17:33] [main/DEBUG] [FML/]: Examining file text2speech-1.10.3.jar for potential mods
[17:17:33] [main/DEBUG] [FML/]: The mod container text2speech-1.10.3.jar appears to be missing an mcmod.info file
[17:17:33] [main/DEBUG] [FML/]: Examining file java-objc-bridge-1.0.0.jar for potential mods
[17:17:33] [main/DEBUG] [FML/]: The mod container java-objc-bridge-1.0.0.jar appears to be missing an mcmod.info file
[17:17:33] [main/DEBUG] [FML/]: Examining file 1.12.2.jar for potential mods
[17:17:33] [main/DEBUG] [FML/]: The mod container 1.12.2.jar appears to be missing an mcmod.info file
[17:17:34] [main/DEBUG] [FML/]: Examining file MercuriusUpdater-1.12.2-1.0.0.14.jar for potential mods
[17:17:34] [main/TRACE] [FML/]: Located mcmod.info file in file MercuriusUpdater-1.12.2-1.0.0.14.jar
[17:17:34] [main/DEBUG] [FML/]: Identified a mod of type Lnet/minecraftforge/fml/common/Mod; (net.minecraftforge.mercurius.updater.MercuriusUpdaterMod) - loading
[17:17:34] [main/TRACE] [mercurius_updater/]: Parsed dependency info : [] [] []
[17:17:34] [main/INFO] [mercurius_updater/]: Mod mercurius_updater is missing the required element 'name'. Substituting mercurius_updater
[17:17:34] [main/FATAL] [FML/]: Found a duplicate mod mercurius_updater at [/Users/Mega/Library/Application Support/minecraft/mods/MercuriusUpdater-1.12.2-1.0.0.14.jar, /Users/Mega/Library/Application Support/minecraft/libraries/net/minecraftforge/MercuriusUpdater/1.12.2/MercuriusUpdater-1.12.2.jar]
[17:17:34] [main/DEBUG] [FML/]: Bar Step: Loading Resources - Default took 0.006s
[17:17:34] [main/DEBUG] [FML/]: Bar Finished: Reloading - LanguageManager took 0.022s
[17:17:34] [main/DEBUG] [FML/]: Bar Step: Loading Resources - Reloading listeners took 0.023s
[17:17:34] [main/DEBUG] [FML/]: Bar Finished: Loading Resources took 0.029s
[17:17:34] [main/WARN] [FML/]: There were errors previously. Not beginning mod initialization phase
[17:17:34] [main/DEBUG] [FML/]: Bar Finished: Loading Resource - TextureManager took 0.000s
[17:17:35] [main/DEBUG] [FML/]: Bar Finished: Loading Resource - SoundHandler took 0.384s
[17:17:36] [main/DEBUG] [FML/]: Bar Finished: Loading Resource - FontRenderer took 0.005s
[17:17:36] [main/DEBUG] [FML/]: Bar Finished: Loading Resource - FontRenderer took 0.007s
[17:17:36] [main/DEBUG] [FML/]: Bar Finished: Loading Resource - GrassColorReloadListener took 0.046s
[17:17:36] [main/DEBUG] [FML/]: Bar Finished: Loading Resource - FoliageColorReloadListener took 0.011s
[17:17:36] [main/DEBUG] [FML/]: Bar Step: Rendering Setup - GL Setup took 0.001s
[17:17:36] [main/DEBUG] [FML/]: Bar Step: Rendering Setup - Loading Texture Map took 0.011s
[17:17:36] [main/DEBUG] [FML/]: Bar Finished: Loading Resource - B3DLoader took 0.000s
[17:17:36] [main/DEBUG] [FML/]: Bar Finished: Loading Resource - OBJLoader took 0.000s
[17:17:36] [main/DEBUG] [FML/]: Bar Finished: Loading Resource - ModelFluid$FluidLoader took 0.000s
[17:17:36] [main/DEBUG] [FML/]: Bar Finished: Loading Resource - ItemLayerModel$Loader took 0.000s
[17:17:36] [main/DEBUG] [FML/]: Bar Finished: Loading Resource - MultiLayerModel$Loader took 0.000s
[17:17:36] [main/DEBUG] [FML/]: Bar Finished: Loading Resource - ModelDynBucket$LoaderDynBucket took 0.000s
[17:17:36] [main/DEBUG] [FML/]: Bar Finished: Loading Resource - ModelManager took 0.277s
[17:17:36] [main/DEBUG] [FML/]: Bar Step: Rendering Setup - Loading Model Manager took 0.444s
[17:17:37] [main/DEBUG] [FML/]: Bar Finished: Loading Resource - RenderItem took 0.005s
[17:17:37] [main/DEBUG] [FML/]: Bar Step: Rendering Setup - Loading Item Renderer took 0.473s
[17:17:37] [main/DEBUG] [FML/]: Bar Finished: Loading Resource - EntityRenderer took 0.000s
[17:17:37] [main/DEBUG] [FML/]: Bar Finished: Loading Resource - BlockRendererDispatcher took 0.000s
[17:17:37] [main/DEBUG] [FML/]: Bar Finished: Loading Resource - RenderGlobal took 0.000s
[17:17:37] [main/DEBUG] [FML/]: Bar Finished: Loading Resource - SearchTreeManager took 0.254s
[17:17:38] [main/DEBUG] [FML/]: Bar Step: Rendering Setup - Loading Entity Renderer took 1.033s
[17:17:38] [main/DEBUG] [FML/]: Bar Finished: Rendering Setup took 1.963s
Basicaly you have 2 mods in your mod folder wich are named differently but are the same, try going in you mod folder and deleting MercuriusUpdater-1.12.2.jar
I don't have a mod called MercuriusUpdater-1.12.2.jar. I even took all of my mods out of the mod folder one by one, and it still crashes. Here is a list of the mods I have: inventorypets-1.12-1.4.9.9 jar, Neat-Mod-1.12.jar, defiledlands-1.12.2-1.0.0.jar, fencejumper-1.12-1.0.1.jar, MCA-1.12.x-5.3.1-universal.jar, mapwriter-2-Mod-1.12.1.jar, Fast-Leave-Decay-Mod-1.12.1.jar, astikoor-1.0.0.jar, jei_1.10.2-3.14.7.417.jar, RadixCore-1.12.2.jar,
BiomesOPlenty-1.12.2-7.0.1.universal.jar, MrCrayfishs-Device-1.12.2.jar, Backpacks-Mod-by-Brad-1.12.2.jar, and
Wearable-Backpacks-1.12.2.jar.
I don't understand ;(
Never mind, my sister figured out what was wrong and fixed it. Thanks for your help though.
Could you ask her how then possibly tell me? Im having the same issue but my brother couldnt figure it out so im kinda all out of options. If you could, that would be great. If not thats fine as well.