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  1. J

    Error running FTB Monster server for the first time.

    I downloaded the server form the website and the launcher and every time I launch the .bat I get this and it pauses: 2015-08-22 14:30:49 [SEVERE] [ForgeModLoader] Unable to launch java.util.ConcurrentModificationException at java.util.ArrayList$Itr.checkForComodification(Unknown Source)...