java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at org.spongepowered.asm.mixin.transformer.MixinInfo.readInnerClasses(MixinInfo.java:475)
at org.spongepowered.asm.mixin.transformer.MixinInfo.validate(MixinInfo.java:283)
at org.spongepowered.asm.mixin.transformer.MixinConfig.postInitialise(MixinConfig.java:317)
at org.spongepowered.asm.mixin.transformer.MixinTransformer.initConfigs(MixinTransformer.java:561)
at org.spongepowered.asm.mixin.transformer.MixinTransformer.init(MixinTransformer.java:483)
at org.spongepowered.asm.mixin.transformer.MixinTransformer.transform(MixinTransformer.java:391)
at org.spongepowered.asm.mixin.transformer.MixinTransformer$Proxy.transform(MixinTransformer.java:107)
at net.minecraft.launchwrapper.LaunchClassLoader.runTransformers(LaunchClassLoader.java:279)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:348)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:131)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at cpw.mods.fml.relauncher.ServerLaunchWrapper.run(ServerLaunchWrapper.java:43)
at cpw.mods.fml.relauncher.ServerLaunchWrapper.main(ServerLaunchWrapper.java:12)

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