Can't run Test Environment! Please Help

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Can't run Test Environment! Please Help

Hey, I can not get my test enviroment to load up. I just get this error (By the way, im on MCreator 1.4.8 (1.4.2.1) [1.6.4]):

 

== MCP 8.09 (data: 8.11, client: 1.6.4, server: 1.6.4) ==
[19:45:21] Jan 20, 2015 7:45:21 PM net.minecraft.launchwrapper.LogWrapper log
[19:45:21] INFO: Loading tweak class name cpw.mods.fml.common.launcher.FMLTweaker
[19:45:21] Jan 20, 2015 7:45:21 PM net.minecraft.launchwrapper.LogWrapper log
[19:45:21] INFO: Using primary tweak class name cpw.mods.fml.common.launcher.FMLTweaker
[19:45:21] Jan 20, 2015 7:45:21 PM net.minecraft.launchwrapper.LogWrapper log
[19:45:21] INFO: Calling tweak class cpw.mods.fml.common.launcher.FMLTweaker
[19:45:21] 2015-01-20 19:45:21 [INFO] [ForgeModLoader] Forge Mod Loader version 6.4.45.953 for Minecraft 1.6.4 loading
[19:45:21] 2015-01-20 19:45:21 [INFO] [ForgeModLoader] Java is Java HotSpot(TM) 64-Bit Server VM, version 1.8.0_25, running on Windows 7:amd64:6.1, installed at C:\Program Files\Java\jdk1.8.0_25\jre
[19:45:21] 2015-01-20 19:45:21 [INFO] [ForgeModLoader] Managed to load a deobfuscated Minecraft name- we are in a deobfuscated environment. Skipping runtime deobfuscation
[19:45:21] 2015-01-20 19:45:21 [INFO] [ForgeModLoader] Loading tweak class name cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
[19:45:21] 2015-01-20 19:45:21 [INFO] [ForgeModLoader] Loading tweak class name cpw.mods.fml.common.launcher.FMLDeobfTweaker
[19:45:21] 2015-01-20 19:45:21 [INFO] [ForgeModLoader] Calling tweak class cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
[19:45:21] 2015-01-20 19:45:21 [SEVERE] [ForgeModLoader] Unable to launch
[19:45:21] java.util.ConcurrentModificationException
[19:45:21] at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:901)
[19:45:21] at java.util.ArrayList$Itr.remove(ArrayList.java:865)
[19:45:21] at net.minecraft.launchwrapper.Launch.launch(Launch.java:114)
[19:45:21] at net.minecraft.launchwrapper.Launch.main(Launch.java:27)
[19:45:21] Java HotSpot(TM) 64-Bit Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future release
 


Wes
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Answer

IF you are using java 8u20 than you can't run górę on MC 1.6.4 to 1.7.10 (they fix this in force update )

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RE:Answer

@Wes So what do I need to do to fix this? change my java?

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RE:RE:Answer

@Gillton

Link Than Find In Forge Same File And Paste This as the Old One

http://www.minecraftforum.net/forums/mapping-and-modding/minecraft-mods/...

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The Best Way Is to Use Java

The Best Way Is to Use Java Converter for Fore 1.6.4
Or Use MCreator For 1.7.10

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RE:The Best Way Is to Use Java

@Wes I just tried the link and putting the coremodmanager.java in the right folder and replacing the old one but im still getting the error mesage. The client is not even popping up. I need to make it on 1.6.4 as I want to add the mod I have made to my public pack :) is it possible to make a 1.6.4 mod on a later version of MCreator?