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java.util.ConcurrentModificationException: 	at java.util.LinkedHashMap$LinkedHashIterator.nextEntry(Unknown Source)	at java.util.LinkedHashMap$KeyIterator.next(Unknown Source)	at org.springframework.richclient.command.ExpansionPointGroupMember.fill(ExpansionPointGroupMember.java:169)	at org.springframework.richclient.command.GroupMemberContainerManager.rebuildControlsFor(GroupMemberContainerManager.java:64)	at org.springframework.richclient.command.GroupMemberList.rebuildControls(GroupMemberList.java:91)	at org.springframework.richclient.command.CommandGroup.rebuildAllControls(CommandGroup.java:352)	at org.springframework.richclient.command.CommandGroup.rebuildIfNecessary(CommandGroup.java:343)	at org.springframework.richclient.command.CommandGroup.remove(CommandGroup.java:307)	at org.springframework.richclient.command.CommandGroup.remove(CommandGroup.java:296)