[rules-users] Drools error log msg?

Hi list, I see the following error msg in my drools log but I don't know how to interpret this. Do I have a serious problem here? Has anybody a clue? Thanks in advance. Cheers, -markus | Error ==>[AfterActivationFiredEvent: getActivation()=[Activation rule=UpdateAlertRule, act#=37, salience=900, tuple=[fact 0:19:184363445:184363445:19:DEFAULT:rapideca.plugins.rbm.entity.Event : 19] ], getKnowledgeRuntime()=org.drools.impl.StatefulKnowledgeSessionImpl@6dd4ab87] | Error ==>[BeforeActivationFiredEvent: getActivation()=[Activation rule=EventRetractionRule, act#=36, salience=1, tuple=[fact 0:19:184363445:184363445:19:DEFAULT:rapideca.plugins.rbm.entity.Event : 19] ], getKnowledgeRuntime()=org.drools.impl.StatefulKnowledgeSessionImpl@6dd4ab87] EventRetractionRule is processed. | Error ==>[ObjectRetractedEventImpl: getFactHandle()=[fact 0:19:184363445:184363445:19:DEFAULT:rapideca.plugins.rbm.entity.Event : 19], getOldObject()=rapideca.plugins.rbm.entity.Event : 19, getKnowledgeRuntime()=org.drools.impl.StatefulKnowledgeSessionImpl@6dd4ab87, getPropagationContext()=PropagationContextImpl [activeActivations=0, dormantActivations=2, entryPoint=EntryPoint::DEFAULT, factHandle=[fact 0:19:184363445:184363445:19:DEFAULT:rapideca.plugins.rbm.entity.Event : 19], leftTuple=[fact 0:19:184363445:184363445:19:DEFAULT:rapideca.plugins.rbm.entity.Event : 19] , originOffset=-1, propagationNumber=40, rule=[Rule name=EventRetractionRule, agendaGroup=MAIN, salience=1, no-loop=true], type=1]] 2014-02-25 08:59:03,524 [eventQueueReceiverJmsListenerContainer-1] INFO log.RuleLogHandler - RuleLog with id: 38 was successfully saved. | Error ==>[AfterActivationFiredEvent: getActivation()=[Activation rule=EventRetractionRule, act#=36, salience=1, tuple=[fact 0:-1:184363445:184363445:19:null:null] ], getKnowledgeRuntime()=org.drools.impl.StatefulKnowledgeSessionImpl@6dd4ab87]