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Failed to start Minecraft:

java.lang.reflect.InvocationTargetException

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 org.multimc.onesix.OneSixLauncher.launchWithMainClass(OneSixLauncher.java:196)

at org.multimc.onesix.OneSixLauncher.launch(OneSixLauncher.java:231)

at org.multimc.EntryPoint.listen(EntryPoint.java:143)

at org.multimc.EntryPoint.main(EntryPoint.java:34)

Caused by: java.lang.IllegalAccessError: tried to access class cbm from class net.minecraft.client.main.Main

at net.minecraft.client.main.Main.main(Main.java:107)

... 8 more

Exiting with -1