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

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java.util.ConcurrentModificationException	at java.util.TreeMap$PrivateEntryIterator.nextEntry(TreeMap.java:1100)	at java.util.TreeMap$KeyIterator.next(TreeMap.java:1154)	at com.pyxis.greenhopper.jira.customfields.RankingCFType.reIndexAll(RankingCFType.java:213)	at com.pyxis.greenhopper.jira.customfields.RankingCFType.updateValue(RankingCFType.java:409)	at com.pyxis.greenhopper.jira.customfields.RankingCFType.updateValue(RankingCFType.java:177)	at com.pyxis.greenhopper.jira.actions.MultipleRankingAction.doRank(MultipleRankingAction.java:47)