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java.util.ConcurrentModificationException: 	at java.util.SubList.checkForComodification(AbstractList.java:855)	at java.util.SubList.listIterator(AbstractList.java:785)	at java.util.AbstractList.listIterator(AbstractList.java:349)	at java.util.SubList.iterator(AbstractList.java:781)	at java.util.AbstractCollection.contains(AbstractCollection.java:94)	at java.util.AbstractCollection.removeAll(AbstractCollection.java:353)	at org.jivesoftware.wildfire.pubsub.LeafNode.purge(LeafNode.java:440)	at org.jivesoftware.wildfire.pubsub.PubSubEngine.purgeNode(PubSubEngine.java:1394)	at org.jivesoftware.wildfire.pubsub.PubSubEngine.process(PubSubEngine.java:238)	at org.jivesoftware.wildfire.pubsub.PubSubModule.process(PubSubModule.java:116)	at org.jivesoftware.wildfire.IQRouter.handle(IQRouter.java:215)	at org.jivesoftware.wildfire.IQRouter.route(IQRouter.java:96)	at org.jivesoftware.wildfire.PacketRouter.route(PacketRouter.java:65)	at org.jivesoftware.wildfire.net.SocketReader.processIQ(SocketReader.java:396)	at org.jivesoftware.wildfire.net.ClientSocketReader.processIQ(ClientSocketReader.java:50)	at org.jivesoftware.wildfire.net.SocketReader.readStream(SocketReader.java:264)	at org.jivesoftware.wildfire.net.SocketReader.run(SocketReader.java:119)	at java.lang.Thread.run(Thread.java:595)