Service errors

Anyone understand what these errors means:

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OPTIMIZE) [Analytic Engine v8.2.1.0 SV62400.DiagnosisEngine.UnknownKey] 2012-05-27 22:20:29.809 EDT ERROR: Unexpected Error
(OPTIMIZE) [Analytic Engine v8.2.1.0 SV62400.DiagnosisEngine.UnknownKey] 2012-05-27 22:20:29.809 EDT ERROR: java.lang.IllegalStateException: Service is not running: ReplicatedCache{Name=DiagnosesCache_svc, State=(SERVICE_STOPPED), Id=85, Version=3.0}
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.ReplicatedCache.checkStatus(ReplicatedCache.CDB:3)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.ReplicatedCache.requestIssue(ReplicatedCache.CDB:1)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.ReplicatedCache.lockResource(ReplicatedCache.CDB:32)
at com.tangosol.coherence.component.util.CacheHandler.lock(CacheHandler.CDB:3)
at com.tangosol.coherence.component.util.SafeNamedCache.lock(SafeNamedCache.CDB:1)
at com.webmethods.sc.caching.impl.CommonCacheImpl.lock(CommonCacheImpl.java:420)
at com.webmethods.optimize.kpi.diagnosis.DiagnosisCache.lockDiagnoses(DiagnosisCache.java:44)
at com.webmethods.optimize.kpi.diagnosis.DiagnosisAbstractionLayer.lockDiagnoses(DiagnosisAbstractionLayer.java:106)
at com.webmethods.optimize.kpi.diagnosis.DiagnosisEngine.addKPIReadingPayload(DiagnosisEngine.java:170)
at com.webmethods.optimize.core.KPIAggregateJmsMessageAdapter.addKPIAggregate(KPIAggregateJmsMessageAdapter.java:44)
at com.webmethods.optimize.core.KPIAggregateJmsMessageAdapter.adaptJmsMessage(KPIAggregateJmsMessageAdapter.java:62)
at com.webmethods.optimize.service.external.router.JMSListener.onMessage(JMSListener.java:104)
at com.webmethods.optimize.service.external.comm.JMSCommunication$ReceiverThread.run(JMSCommunication.java:611)