So my brother downloaded the LoTR mod on our dell, so to make a LAN world I went on to our older Samsung(runs Windows 7) and did what we usually do to run a mod, but this time, it didn't start. I looked up the error and everything that came up was a crash log and how to fix it, but the thing with my problem is that it didn't seem to crash. Instead of a crash report, the minecraft window never opened, however the launcher says everything it usually says before it starts. I tried going back to 1.7.2, I tried removing and redownloading forge, and redownloading the mod, but nothing seems to work. Eventually I poked around the internet and found out where to find forge crash reports, or whatever they are. Forge report is below, but I'm no tech wizard and can't make heads or tails of it.
[12:50:15] [main/INFO] [FML/]: Forge Mod Loader version 7.10.18.1180 for Minecraft 1.7.10 loading
[12:50:15] [main/INFO] [FML/]: Java is Java HotSpot(TM) Client VM, version 1.8.0_20, running on Windows 8.1:x86:6.3, installed at C:\Program Files (x86)\Java\jre1.8.0_20
[12:50:15] [main/DEBUG] [FML/]: Java classpath at launch is C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\net\minecraftforge\forge\1.7.10-10.13.0.1180\forge-1.7.10-10.13.0.1180.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\net\minecraft\launchwrapper\1.9\launchwrapper-1.9.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\org\ow2\asm\asm-all\4.1\asm-all-4.1.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\com\typesafe\akka\akka-actor_2.11\2.3.3\akka-actor_2.11-2.3.3.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\com\typesafe\config\1.2.1\config-1.2.1.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\org\scala-lang\scala-actors-migration_2.11\1.1.0\scala-actors-migration_2.11-1.1.0.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\org\scala-lang\scala-compiler\2.11.1\scala-compiler-2.11.1.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\org\scala-lang\plugins\scala-continuations-library_2.11\1.0.2\scala-continuations-library_2.11-1.0.2.jar;C:\Users\abelitob_2\AppData\Roaming\.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;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\org\scala-lang\scala-library\2.11.1\scala-library-2.11.1.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\org\scala-lang\scala-parser-combinators_2.11\1.0.1\scala-parser-combinators_2.11-1.0.1.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\org\scala-lang\scala-reflect\2.11.1\scala-reflect-2.11.1.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\org\scala-lang\scala-swing_2.11\1.0.1\scala-swing_2.11-1.0.1.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\org\scala-lang\scala-xml_2.11\1.0.2\scala-xml_2.11-1.0.2.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\net\sf\jopt-simple\jopt-simple\4.5\jopt-simple-4.5.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\lzma\lzma\0.0.1\lzma-0.0.1.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\com\mojang\realms\1.3.1\realms-1.3.1.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\org\apache\commons\commons-compress\1.8.1\commons-compress-1.8.1.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\org\apache\httpcomponents\httpclient\4.3.3\httpclient-4.3.3.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\commons-logging\commons-logging\1.1.3\commons-logging-1.1.3.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\org\apache\httpcomponents\httpcore\4.3.2\httpcore-4.3.2.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\java3d\vecmath\1.3.1\vecmath-1.3.1.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\net\sf\trove4j\trove4j\3.0.3\trove4j-3.0.3.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\com\ibm\icu\icu4j-core-mojang\51.2\icu4j-core-mojang-51.2.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\com\paulscode\codecjorbis\20101023\codecjorbis-20101023.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\com\paulscode\codecwav\20101023\codecwav-20101023.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\com\paulscode\libraryjavasound\20101123\libraryjavasound-20101123.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\com\paulscode\librarylwjglopenal\20100824\librarylwjglopenal-20100824.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\com\paulscode\soundsystem\20120107\soundsystem-20120107.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\io\netty\netty-all\4.0.10.Final\netty-all-4.0.10.Final.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\com\google\guava\guava\16.0\guava-16.0.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\org\apache\commons\commons-lang3\3.2.1\commons-lang3-3.2.1.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\commons-io\commons-io\2.4\commons-io-2.4.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\commons-codec\commons-codec\1.9\commons-codec-1.9.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\net\java\jinput\jinput\2.0.5\jinput-2.0.5.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\net\java\jutils\jutils\1.0.0\jutils-1.0.0.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\com\google\code\gson\gson\2.2.4\gson-2.2.4.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\com\mojang\authlib\1.5.16\authlib-1.5.16.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\org\apache\logging\log4j\log4j-api\2.0-beta9\log4j-api-2.0-beta9.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\org\apache\logging\log4j\log4j-core\2.0-beta9\log4j-core-2.0-beta9.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\org\lwjgl\lwjgl\lwjgl\2.9.1\lwjgl-2.9.1.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\org\lwjgl\lwjgl\lwjgl_util\2.9.1\lwjgl_util-2.9.1.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\tv\twitch\twitch\5.16\twitch-5.16.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\versions\1.7.10-Forge10.13.0.1180\1.7.10-Forge10.13.0.1180.jar
[12:50:15] [main/DEBUG] [FML/]: Java library path at launch is C:\Users\abelitob_2\AppData\Roaming\.minecraft\versions\1.7.10-Forge10.13.0.1180\1.7.10-Forge10.13.0.1180-natives-192745683313391
[12:50:15] [main/DEBUG] [FML/]: Enabling runtime deobfuscation
[12:50:15] [main/DEBUG] [FML/]: Instantiating coremod class FMLCorePlugin
[12:50:15] [main/DEBUG] [FML/]: Added access transformer class cpw.mods.fml.common.asm.transformers.AccessTransformer to enqueued access transformers
[12:50:15] [main/DEBUG] [FML/]: Enqueued coremod FMLCorePlugin
[12:50:15] [main/DEBUG] [FML/]: Instantiating coremod class FMLForgePlugin
[12:50:15] [main/DEBUG] [FML/]: Added access transformer class net.minecraftforge.transformers.ForgeAccessTransformer to enqueued access transformers
[12:50:15] [main/DEBUG] [FML/]: Enqueued coremod FMLForgePlugin
[12:50:15] [main/DEBUG] [FML/]: All fundamental core mods are successfully located
[12:50:15] [main/DEBUG] [FML/]: Discovering coremods
[12:50:15] [main/INFO] [LaunchWrapper/]: Loading tweak class name cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
[12:50:15] [main/INFO] [LaunchWrapper/]: Loading tweak class name cpw.mods.fml.common.launcher.FMLDeobfTweaker
[12:50:15] [main/INFO] [LaunchWrapper/]: Calling tweak class cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
[12:50:15] [main/ERROR] [LaunchWrapper/]: Unable to launch
java.util.ConcurrentModificationException
at java.util.ArrayList$Itr.checkForComodification(Unknown Source) ~[?:1.8.0_20]
at java.util.ArrayList$Itr.remove(Unknown Source) ~[?:1.8.0_20]
at net.minecraft.launchwrapper.Launch.launch(Launch.java:117) [launchwrapper-1.9.jar:?]
at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.9.jar:?]
As you can see in the report one thing stuck out to me (and actually made sense)
At the moment, probably best to use the latest version of java 7: https://java.com/en/download/manual.jsp (just a heads up, you'll want the 32bit windows version for that pc)
You will also need to either uninstall 8 or set 7 as the default version to use in your windows control panel java settings. (Control Panel->Java->Java"tab") Enable 1.7.0_67, disable others.
[12:50:15] [main/INFO] [FML/]: Forge Mod Loader version 7.10.18.1180 for Minecraft 1.7.10 loading
[12:50:15] [main/INFO] [FML/]: Java is Java HotSpot(TM) Client VM, version 1.8.0_20, running on Windows 8.1:x86:6.3, installed at C:\Program Files (x86)\Java\jre1.8.0_20
[12:50:15] [main/DEBUG] [FML/]: Java classpath at launch is C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\net\minecraftforge\forge\1.7.10-10.13.0.1180\forge-1.7.10-10.13.0.1180.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\net\minecraft\launchwrapper\1.9\launchwrapper-1.9.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\org\ow2\asm\asm-all\4.1\asm-all-4.1.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\com\typesafe\akka\akka-actor_2.11\2.3.3\akka-actor_2.11-2.3.3.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\com\typesafe\config\1.2.1\config-1.2.1.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\org\scala-lang\scala-actors-migration_2.11\1.1.0\scala-actors-migration_2.11-1.1.0.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\org\scala-lang\scala-compiler\2.11.1\scala-compiler-2.11.1.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\org\scala-lang\plugins\scala-continuations-library_2.11\1.0.2\scala-continuations-library_2.11-1.0.2.jar;C:\Users\abelitob_2\AppData\Roaming\.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;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\org\scala-lang\scala-library\2.11.1\scala-library-2.11.1.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\org\scala-lang\scala-parser-combinators_2.11\1.0.1\scala-parser-combinators_2.11-1.0.1.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\org\scala-lang\scala-reflect\2.11.1\scala-reflect-2.11.1.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\org\scala-lang\scala-swing_2.11\1.0.1\scala-swing_2.11-1.0.1.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\org\scala-lang\scala-xml_2.11\1.0.2\scala-xml_2.11-1.0.2.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\net\sf\jopt-simple\jopt-simple\4.5\jopt-simple-4.5.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\lzma\lzma\0.0.1\lzma-0.0.1.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\com\mojang\realms\1.3.1\realms-1.3.1.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\org\apache\commons\commons-compress\1.8.1\commons-compress-1.8.1.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\org\apache\httpcomponents\httpclient\4.3.3\httpclient-4.3.3.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\commons-logging\commons-logging\1.1.3\commons-logging-1.1.3.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\org\apache\httpcomponents\httpcore\4.3.2\httpcore-4.3.2.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\java3d\vecmath\1.3.1\vecmath-1.3.1.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\net\sf\trove4j\trove4j\3.0.3\trove4j-3.0.3.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\com\ibm\icu\icu4j-core-mojang\51.2\icu4j-core-mojang-51.2.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\com\paulscode\codecjorbis\20101023\codecjorbis-20101023.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\com\paulscode\codecwav\20101023\codecwav-20101023.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\com\paulscode\libraryjavasound\20101123\libraryjavasound-20101123.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\com\paulscode\librarylwjglopenal\20100824\librarylwjglopenal-20100824.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\com\paulscode\soundsystem\20120107\soundsystem-20120107.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\io\netty\netty-all\4.0.10.Final\netty-all-4.0.10.Final.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\com\google\guava\guava\16.0\guava-16.0.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\org\apache\commons\commons-lang3\3.2.1\commons-lang3-3.2.1.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\commons-io\commons-io\2.4\commons-io-2.4.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\commons-codec\commons-codec\1.9\commons-codec-1.9.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\net\java\jinput\jinput\2.0.5\jinput-2.0.5.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\net\java\jutils\jutils\1.0.0\jutils-1.0.0.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\com\google\code\gson\gson\2.2.4\gson-2.2.4.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\com\mojang\authlib\1.5.16\authlib-1.5.16.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\org\apache\logging\log4j\log4j-api\2.0-beta9\log4j-api-2.0-beta9.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\org\apache\logging\log4j\log4j-core\2.0-beta9\log4j-core-2.0-beta9.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\org\lwjgl\lwjgl\lwjgl\2.9.1\lwjgl-2.9.1.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\org\lwjgl\lwjgl\lwjgl_util\2.9.1\lwjgl_util-2.9.1.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\libraries\tv\twitch\twitch\5.16\twitch-5.16.jar;C:\Users\abelitob_2\AppData\Roaming\.minecraft\versions\1.7.10-Forge10.13.0.1180\1.7.10-Forge10.13.0.1180.jar
[12:50:15] [main/DEBUG] [FML/]: Java library path at launch is C:\Users\abelitob_2\AppData\Roaming\.minecraft\versions\1.7.10-Forge10.13.0.1180\1.7.10-Forge10.13.0.1180-natives-192745683313391
[12:50:15] [main/DEBUG] [FML/]: Enabling runtime deobfuscation
[12:50:15] [main/DEBUG] [FML/]: Instantiating coremod class FMLCorePlugin
[12:50:15] [main/DEBUG] [FML/]: Added access transformer class cpw.mods.fml.common.asm.transformers.AccessTransformer to enqueued access transformers
[12:50:15] [main/DEBUG] [FML/]: Enqueued coremod FMLCorePlugin
[12:50:15] [main/DEBUG] [FML/]: Instantiating coremod class FMLForgePlugin
[12:50:15] [main/DEBUG] [FML/]: Added access transformer class net.minecraftforge.transformers.ForgeAccessTransformer to enqueued access transformers
[12:50:15] [main/DEBUG] [FML/]: Enqueued coremod FMLForgePlugin
[12:50:15] [main/DEBUG] [FML/]: All fundamental core mods are successfully located
[12:50:15] [main/DEBUG] [FML/]: Discovering coremods
[12:50:15] [main/INFO] [LaunchWrapper/]: Loading tweak class name cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
[12:50:15] [main/INFO] [LaunchWrapper/]: Loading tweak class name cpw.mods.fml.common.launcher.FMLDeobfTweaker
[12:50:15] [main/INFO] [LaunchWrapper/]: Calling tweak class cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
[12:50:15] [main/ERROR] [LaunchWrapper/]: Unable to launch
java.util.ConcurrentModificationException
at java.util.ArrayList$Itr.checkForComodification(Unknown Source) ~[?:1.8.0_20]
at java.util.ArrayList$Itr.remove(Unknown Source) ~[?:1.8.0_20]
at net.minecraft.launchwrapper.Launch.launch(Launch.java:117) [launchwrapper-1.9.jar:?]
at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.9.jar:?]
Unable to launch
Help?
Again, I'm no computer geek so what version would I use? Is 8 the latest version?
You will also need to either uninstall 8 or set 7 as the default version to use in your windows control panel java settings. (Control Panel->Java->Java"tab") Enable 1.7.0_67, disable others.