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java.util.ConcurrentModificationException: 	at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372)	at java.util.AbstractList$Itr.next(AbstractList.java:343)	at java.util.Collections$UnmodifiableCollection$1.next(Collections.java:1010)	at com.atlassian.plugin.util.collect.TransformingIterator.next(TransformingIterator.java:35)	at com.atlassian.plugin.util.collect.CollectionUtil.foreach(CollectionUtil.java:17)	at com.atlassian.plugin.util.collect.CollectionUtil.toList(CollectionUtil.java:37)	at com.atlassian.plugin.util.collect.CollectionUtil.transform(CollectionUtil.java:52)	at com.atlassian.plugin.util.collect.CollectionUtil.transform(CollectionUtil.java:61)	at com.atlassian.greenhopper.service.project.ProjectHistoryServiceImpl.registerRecentProjectsWithProjects(ProjectHistoryServiceImpl.java:84)	at com.atlassian.greenhopper.service.project.ProjectHistoryServiceImpl.registerRecentProjects(ProjectHistoryServiceImpl.java:53)	at com.atlassian.greenhopper.web.rapid.work.WorkResource.registerRecentProjects(WorkResource.java:114)	at com.atlassian.greenhopper.web.rapid.work.WorkResource.access$4(WorkResource.java:111)	at com.atlassian.greenhopper.web.rapid.work.WorkResource$1.call(WorkResource.java:86)	at com.atlassian.greenhopper.web.rapid.work.WorkResource$1.call(WorkResource.java:1)	at com.atlassian.greenhopper.web.util.RestCall.response(RestCall.java:48)	at com.atlassian.greenhopper.web.AbstractResource.response(AbstractResource.java:48)	at com.atlassian.greenhopper.web.rapid.work.WorkResource.getPoolData(WorkResource.java:58)