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A member of my ftb infinity evolved server apparently tried to put traveler's boots on the leg armor slot, which resulted in an internal server error for him. My server continued to run fine even after the error though. This is his console:

After what was maby two months or so, my old FTB Monster server repeatedly encountered an error when i tried to start the console. This is was where the problem occurred in my console: [SEVERE] [ForgeModLoader] Unable to launch java.util.ConcurrentModificationException at...