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java.util.ConcurrentModificationException at java.util.HashMap$HashIterator.nextEntry( at java.util.HashMap$ at edu.isi.karma.modeling.alignment.AlignmentManager.removeWorkspaceAlignments( at edu.isi.karma.controller.command.CloseWorkspaceCommand.doIt( at edu.isi.karma.controller.history.CommandHistory.doCommand( at edu.isi.karma.webserver.ExecutionController.invokeCommand( at edu.isi.karma.webserver.RequestController.doPost(