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cpw.mods.fml.common.LoaderException: java.lang.NoClassDefFoundError: net/minecraft/client ...

at cpw.mods.fml.common.Loader.initializeMods(Loader.java:692) at cpw.mods.fml.server.FMLServerHandler.finishServerLoading(FMLServerHandler.java:97) at cpw.mods.fml ...
GitHub

cpw.mods.fml.common.LoaderException: java.lang.Error: InvTweaks config load failed

at cpw.mods.fml.common.Loader.initializeMods(Loader.java:692) at cpw.mods.fml.client.FMLClientHandler.finishMinecraftLoading(FMLClientHandler.java:288) at net ...