2015-02-13 13:53:51 [INFO] [ForgeModLoader] Forge Mod Loader version 6.4.49.965 for Minecraft 1.6.4 loading
2015-02-13 13:53:51 [INFO] [ForgeModLoader] Java is Java HotSpot(TM) Client VM, version 1.8.0_31, running on Windows 7:x86:6.1, installed at C:\Program Files\Java\jre1.8.0_31
2015-02-13 13:53:51 [FINE] [ForgeModLoader] Java classpath at launch is C:\Users\Student\Desktop\1.6.4 Magic World 2 Server\minecraftforge-universal-1.6.4-9.11.1.965-v164-pregradle.jar
2015-02-13 13:53:51 [FINE] [ForgeModLoader] Java library path at launch is C:\Program Files\Java\jre1.8.0_31\bin;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;C:\ProgramData\Oracle\Java\javapath;C:\Program Files\Common Files\Microsoft Shared\Windows Live;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files\Windows Live\Shared;C:\Program Files\QuickTime\QTSystem\;C:\Program Files\ATI Technologies\ATI.ACE\Core-Static;C:\Program Files\Calibre2\;.
2015-02-13 13:53:51 [FINE] [ForgeModLoader] Enabling runtime deobfuscation
2015-02-13 13:53:51 [FINE] [ForgeModLoader] Instantiating coremod class FMLCorePlugin
2015-02-13 13:53:51 [FINE] [ForgeModLoader] Enqueued coremod FMLCorePlugin
2015-02-13 13:53:51 [FINE] [ForgeModLoader] Instantiating coremod class FMLForgePlugin
2015-02-13 13:53:51 [FINE] [ForgeModLoader] Enqueued coremod FMLForgePlugin
2015-02-13 13:53:51 [FINE] [ForgeModLoader] All fundamental core mods are successfully located
2015-02-13 13:53:51 [FINE] [ForgeModLoader] Discovering coremods
2015-02-13 13:53:51 [INFO] [ForgeModLoader] Loading tweak class name cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
2015-02-13 13:53:51 [INFO] [ForgeModLoader] Loading tweak class name cpw.mods.fml.common.launcher.FMLDeobfTweaker
2015-02-13 13:53:51 [INFO] [ForgeModLoader] Calling tweak class cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
2015-02-13 13:53:51 [SEVERE] [ForgeModLoader] Unable to launch
java.util.ConcurrentModificationException
	at java.util.ArrayList$Itr.checkForComodification(Unknown Source)
	at java.util.ArrayList$Itr.remove(Unknown Source)
	at net.minecraft.launchwrapper.Launch.launch(Launch.java:114)
	at net.minecraft.launchwrapper.Launch.main(Launch.java:27)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at cpw.mods.fml.relauncher.ServerLaunchWrapper.run(ServerLaunchWrapper.java:48)
	at cpw.mods.fml.relauncher.ServerLaunchWrapper.main(ServerLaunchWrapper.java:17)