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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)