java.util.ConcurrentModificationException: This exception has no message.

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java.util.ConcurrentModificationException:
at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:449)
at java.util.AbstractList$Itr.next(AbstractList.java:420)
at Main.CGuiUpdater.run(CGuiUpdater.java:139)
at java.lang.Thread.run(Thread.java:595)

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