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Okay so I'm trying to install pixelmon but obviously you have to have forge first so i install forge and try to run it. I press play wait and few seconds the launcher disappears but the game doesn't pop up. Please help!

Crash Report



[16:17:30] [main/INFO] [FML/]: Forge Mod Loader version 7.10.18.1180 for Minecraft 1.7.10 loading
[16:17:30] [main/INFO] [FML/]: Java is Java HotSpot(TM) 64-Bit Server VM, version 1.8.0_20, running on Windows 8.1:amd64:6.3, installed at C:\Program Files\Java\jre1.8.0_20
[16:17:30] [main/DEBUG] [FML/]: Java classpath at launch is C:\Users\Steven\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\Steven\AppData\Roaming\.minecraft\libraries\net\minecraft\launchwrapper\1.9\launchwrapper-1.9.jar;C:\Users\Steven\AppData\Roaming\.minecraft\libraries\org\ow2\asm\asm-all\4.1\asm-all-4.1.jar;C:\Users\Steven\AppData\Roaming\.minecraft\libraries\com\typesafe\akka\akka-actor_2.11\2.3.3\akka-actor_2.11-2.3.3.jar;C:\Users\Steven\AppData\Roaming\.minecraft\libraries\com\typesafe\config\1.2.1\config-1.2.1.jar;C:\Users\Steven\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\Steven\AppData\Roaming\.minecraft\libraries\org\scala-lang\scala-compiler\2.11.1\scala-compiler-2.11.1.jar;C:\Users\Steven\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\Steven\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\Steven\AppData\Roaming\.minecraft\libraries\org\scala-lang\scala-library\2.11.1\scala-library-2.11.1.jar;C:\Users\Steven\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\Steven\AppData\Roaming\.minecraft\libraries\org\scala-lang\scala-reflect\2.11.1\scala-reflect-2.11.1.jar;C:\Users\Steven\AppData\Roaming\.minecraft\libraries\org\scala-lang\scala-swing_2.11\1.0.1\scala-swing_2.11-1.0.1.jar;C:\Users\Steven\AppData\Roaming\.minecraft\libraries\org\scala-lang\scala-xml_2.11\1.0.2\scala-xml_2.11-1.0.2.jar;C:\Users\Steven\AppData\Roaming\.minecraft\libraries\net\sf\jopt-simple\jopt-simple\4.5\jopt-simple-4.5.jar;C:\Users\Steven\AppData\Roaming\.minecraft\libraries\lzma\lzma\0.0.1\lzma-0.0.1.jar;C:\Users\Steven\AppData\Roaming\.minecraft\libraries\com\mojang\realms\1.3.1\realms-1.3.1.jar;C:\Users\Steven\AppData\Roaming\.minecraft\libraries\org\apache\commons\commons-compress\1.8.1\commons-compress-1.8.1.jar;C:\Users\Steven\AppData\Roaming\.minecraft\libraries\org\apache\httpcomponents\httpclient\4.3.3\httpclient-4.3.3.jar;C:\Users\Steven\AppData\Roaming\.minecraft\libraries\commons-logging\commons-logging\1.1.3\commons-logging-1.1.3.jar;C:\Users\Steven\AppData\Roaming\.minecraft\libraries\org\apache\httpcomponents\httpcore\4.3.2\httpcore-4.3.2.jar;C:\Users\Steven\AppData\Roaming\.minecraft\libraries\java3d\vecmath\1.3.1\vecmath-1.3.1.jar;C:\Users\Steven\AppData\Roaming\.minecraft\libraries\net\sf\trove4j\trove4j\3.0.3\trove4j-3.0.3.jar;C:\Users\Steven\AppData\Roaming\.minecraft\libraries\com\ibm\icu\icu4j-core-mojang\51.2\icu4j-core-mojang-51.2.jar;C:\Users\Steven\AppData\Roaming\.minecraft\libraries\com\paulscode\codecjorbis\20101023\codecjorbis-20101023.jar;C:\Users\Steven\AppData\Roaming\.minecraft\libraries\com\paulscode\codecwav\20101023\codecwav-20101023.jar;C:\Users\Steven\AppData\Roaming\.minecraft\libraries\com\paulscode\libraryjavasound\20101123\libraryjavasound-20101123.jar;C:\Users\Steven\AppData\Roaming\.minecraft\libraries\com\paulscode\librarylwjglopenal\20100824\librarylwjglopenal-20100824.jar;C:\Users\Steven\AppData\Roaming\.minecraft\libraries\com\paulscode\soundsystem\20120107\soundsystem-20120107.jar;C:\Users\Steven\AppData\Roaming\.minecraft\libraries\io\netty\netty-all\4.0.10.Final\netty-all-4.0.10.Final.jar;C:\Users\Steven\AppData\Roaming\.minecraft\libraries\com\google\guava\guava\16.0\guava-16.0.jar;C:\Users\Steven\AppData\Roaming\.minecraft\libraries\org\apache\commons\commons-lang3\3.2.1\commons-lang3-3.2.1.jar;C:\Users\Steven\AppData\Roaming\.minecraft\libraries\commons-io\commons-io\2.4\commons-io-2.4.jar;C:\Users\Steven\AppData\Roaming\.minecraft\libraries\commons-codec\commons-codec\1.9\commons-codec-1.9.jar;C:\Users\Steven\AppData\Roaming\.minecraft\libraries\net\java\jinput\jinput\2.0.5\jinput-2.0.5.jar;C:\Users\Steven\AppData\Roaming\.minecraft\libraries\net\java\jutils\jutils\1.0.0\jutils-1.0.0.jar;C:\Users\Steven\AppData\Roaming\.minecraft\libraries\com\google\code\gson\gson\2.2.4\gson-2.2.4.jar;C:\Users\Steven\AppData\Roaming\.minecraft\libraries\com\mojang\authlib\1.5.16\authlib-1.5.16.jar;C:\Users\Steven\AppData\Roaming\.minecraft\libraries\org\apache\logging\log4j\log4j-api\2.0-beta9\log4j-api-2.0-beta9.jar;C:\Users\Steven\AppData\Roaming\.minecraft\libraries\org\apache\logging\log4j\log4j-core\2.0-beta9\log4j-core-2.0-beta9.jar;C:\Users\Steven\AppData\Roaming\.minecraft\libraries\org\lwjgl\lwjgl\lwjgl\2.9.1\lwjgl-2.9.1.jar;C:\Users\Steven\AppData\Roaming\.minecraft\libraries\org\lwjgl\lwjgl\lwjgl_util\2.9.1\lwjgl_util-2.9.1.jar;C:\Users\Steven\AppData\Roaming\.minecraft\libraries\tv\twitch\twitch\5.16\twitch-5.16.jar;C:\Users\Steven\AppData\Roaming\.minecraft\versions\1.7.10-Forge10.13.0.1180\1.7.10-Forge10.13.0.1180.jar
[16:17:30] [main/DEBUG] [FML/]: Java library path at launch is C:\Users\Steven\AppData\Roaming\.minecraft\versions\1.7.10-Forge10.13.0.1180\1.7.10-Forge10.13.0.1180-natives-173765426725108
[16:17:30] [main/DEBUG] [FML/]: Enabling runtime deobfuscation
[16:17:30] [main/DEBUG] [FML/]: Instantiating coremod class FMLCorePlugin
[16:17:30] [main/DEBUG] [FML/]: Added access transformer class cpw.mods.fml.common.asm.transformers.AccessTransformer to enqueued access transformers
[16:17:30] [main/DEBUG] [FML/]: Enqueued coremod FMLCorePlugin
[16:17:30] [main/DEBUG] [FML/]: Instantiating coremod class FMLForgePlugin
[16:17:30] [main/DEBUG] [FML/]: Added access transformer class net.minecraftforge.transformers.ForgeAccessTransformer to enqueued access transformers
[16:17:30] [main/DEBUG] [FML/]: Enqueued coremod FMLForgePlugin
[16:17:30] [main/DEBUG] [FML/]: All fundamental core mods are successfully located
[16:17:30] [main/DEBUG] [FML/]: Discovering coremods
[16:17:30] [main/DEBUG] [FML/]: Examining for coremod candidacy Pixelmon-1.7.10-3.2.5-universal.jar
[16:17:30] [main/DEBUG] [FML/]: Not found coremod data in Pixelmon-1.7.10-3.2.5-universal.jar
[16:17:30] [main/INFO] [LaunchWrapper/]: Loading tweak class name cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
[16:17:30] [main/INFO] [LaunchWrapper/]: Loading tweak class name cpw.mods.fml.common.launcher.FMLDeobfTweaker
[16:17:30] [main/INFO] [LaunchWrapper/]: Calling tweak class cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
[16:17:30] [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:?]

Guys i seriously need your help! I thought the fourms had a good majority of nice people!

We are having the same issue. No one is helping me either. I was able to get forge and pixelmon to work well on my laptop. My son's computer for some reason is not allowing it. Minecraft will crash! It is driving me crazy and no one helps. Hopefully you will get some one to answer you. I don't know where else we can look. Every you tube video or online resouce doesn't help with our situation.

We may be asking in the wrong spot. Here is a youtube video:

Minecraft: How to get your crash report by jdouglas fisher. If you don't mind, I will send you a link to my post and if you don't mind send me your link. Hopefully one of us will get a response :)!!