Illarion.org

Unexpected exception: java.lang.reflect.InvocationTargetException

Eh? How might I be able to fix the above error?

Did you try the usual voodoo? Uninstall and reinstall the client?

You can uninstall by running

javaws -viewer

From RUN or Console.

Then find illarion client and delete it.

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That exception occurs when java finds two procedures with the same name in different packages and doesn't know which to use. So I assume your client got corrupted in some manner.