Error in event.log

I have this error message in event.log and there is similar error appear in the GUI.
Anyone can help

I have tried restarting the zopectl, as well as the whole zenoss, but still same.

2015-01-28T13:10:18 ERROR Zope.SiteErrorLog 1422421818.470.191781523074 http://172.16.x.x:8080/zport/dmd/Events/jobs_router
Traceback (innermost last):
Module ZPublisher.Publish, line 126, in publish
Module ZPublisher.mapply, line 77, in mapply
Module ZPublisher.Publish, line 46, in call_object
Module Products.ZenUtils.extdirect.zope.router, line 22, in __call__
Module Products.ZenUtils.jsonutils, line 156, in inner
Module Products.ZenUtils.extdirect.router, line 130, in __call__
Module Products.ZenUtils.extdirect.router, line 138, in _processDirectRequest
Module transaction._manager, line 101, in savepoint
Module transaction._transaction, line 263, in savepoint
Module transaction._transaction, line 378, in _saveAndRaiseCommitishError
Module transaction._transaction, line 260, in savepoint
Module transaction._transaction, line 697, in __init__
Module ZODB.Connection, line 1123, in savepoint
Module ZODB.Connection, line 623, in _commit
Module ZODB.Connection, line 658, in _store_objects
Module ZODB.serialize, line 422, in serialize
SystemError: NULL object passed to Py_BuildValue