Kepler

I get the following exception:

java.lang.NullPointerException
at org.kepler.moml.NamedObjId.changeExecuted(NamedObjId.java:222)
at ptolemy.kernel.util.ChangeRequest.execute(ChangeRequest.java:202)
at ptolemy.kernel.util.NamedObj.executeChangeRequests(NamedObj.java:699)
at ptolemy.kernel.util.NamedObj.setDeferringChangeRequests(NamedObj.java:1735)
at ptolemy.kernel.util.NamedObj.executeChangeRequests(NamedObj.java:704)
at ptolemy.kernel.util.NamedObj.requestChange(NamedObj.java:1687)
at ptolemy.actor.CompositeActor.requestChange(CompositeActor.java:1349)
at ptolemy.kernel.util.NamedObj.requestChange(NamedObj.java:1670)
at org.kepler.monitor.MonitorManager._addMonitorAttributeForEntity(MonitorManager.java:585)
at org.kepler.monitor.MonitorManager._monitor(MonitorManager.java:521)
at org.kepler.monitor.MonitorManager._initialize(MonitorManager.java:472)
at org.kepler.monitor.MonitorManager.initialize(MonitorManager.java:279)
at ptolemy.actor.CompositeActor.initialize(CompositeActor.java:656)
at ptolemy.actor.Manager.initialize(Manager.java:615)
at ptolemy.actor.Manager.execute(Manager.java:338)
at ptolemy.actor.Manager.run(Manager.java:1118)
at ptolemy.actor.Manager$3.run(Manager.java:1159)

when I try to run this workflow:

https://code.kepler-project.org/code/kepler/trunk/workflows/test/monitor/monitor-0.xml