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java.util.ConcurrentModificationException: 	at java.util.HashMap$HashIterator.nextNode(HashMap.java:1437)	at java.util.HashMap$KeyIterator.next(HashMap.java:1461)	at josh.nonHttp.GenericMiTMServer.Closed(GenericMiTMServer.java:434)	at josh.nonHttp.SendData.SendClosedEventTrigger(SendData.java:81)	at josh.nonHttp.SendData.run(SendData.java:317)	at java.lang.Thread.run(Thread.java:745)