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Minecraft forge and modpack launchers wont work

MrCreeper242
in Mods

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Posted

I try to launch a modpack or a mod with forge but it just crashes with this error.

 

[22/9/2014 11:44:29 AM] [main/ERROR]: Unable to launch

[22/9/2014 11:44:29 AM] java.lang.ClassNotFoundException: cpw.mods.fml.common.launcher.FMLTweaker

 

Somebody please help!

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