java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at com.ibm.etools.references.internal.management.InternalReferenceManager.deactivate(InternalReferenceManager.java:1153)
at com.ibm.etools.references.management.ReferenceManager.deactivate(ReferenceManager.java:321)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:95)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:55)
at java.lang.reflect.Method.invoke(Method.java:507)
at org.eclipse.equinox.internal.ds.model.ServiceComponent.deactivate(ServiceComponent.java:363)
at org.eclipse.equinox.internal.ds.model.ServiceComponentProp.deactivate(ServiceComponentProp.java:161)
at org.eclipse.equinox.internal.ds.model.ServiceComponentProp.dispose(ServiceComponentProp.java:387)
at org.eclipse.equinox.internal.ds.model.ServiceComponentProp.dispose(ServiceComponentProp.java:102)
at org.eclipse.equinox.internal.ds.InstanceProcess.disposeInstances(InstanceProcess.java:366)
at org.eclipse.equinox.internal.ds.InstanceProcess.disposeInstances(InstanceProcess.java:306)
at org.eclipse.equinox.internal.ds.Resolver.disposeComponentConfigs(Resolver.java:724)
at org.eclipse.equinox.internal.ds.Resolver.disableComponents(Resolver.java:700)
at org.eclipse.equinox.internal.ds.SCRManager.stoppingBundle(SCRManager.java:554)
at org.eclipse.equinox.internal.ds.SCRManager.bundleChanged(SCRManager.java:233)
at org.eclipse.osgi.internal.framework.BundleContextImpl.dispatchEvent(BundleContextImpl.java:902)
at org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:230)
at org.eclipse.osgi.framework.eventmgr.ListenerQueue.dispatchEventSynchronous(ListenerQueue.java:148)
at org.eclipse.osgi.internal.framework.EquinoxEventPublisher.publishBundleEventPrivileged(EquinoxEventPublisher.java:165)
at org.eclipse.osgi.internal.framework.EquinoxEventPublisher.publishBundleEvent(EquinoxEventPublisher.java:75)
at org.eclipse.osgi.internal.framework.EquinoxEventPublisher.publishBundleEvent(EquinoxEventPublisher.java:67)
at org.eclipse.osgi.internal.framework.EquinoxContainerAdaptor.publishModuleEvent(EquinoxContainerAdaptor.java:102)
at org.eclipse.osgi.container.Module.publishEvent(Module.java:466)
at org.eclipse.osgi.container.Module.doStop(Module.java:624)
at org.eclipse.osgi.container.Module.stop(Module.java:488)
at org.eclipse.osgi.container.ModuleContainer$ContainerStartLevel.decStartLevel(ModuleContainer.java:1623)
at org.eclipse.osgi.container.ModuleContainer$ContainerStartLevel.doContainerStartLevel(ModuleContainer.java:1542)
at org.eclipse.osgi.container.SystemModule.stopWorker(SystemModule.java:248)
at org.eclipse.osgi.internal.framework.EquinoxBundle$SystemBundle$EquinoxSystemModule.stopWorker(EquinoxBundle.java:145)
at org.eclipse.osgi.container.Module.doStop(Module.java:626)
at org.eclipse.osgi.container.Module.stop(Module.java:488)
at org.eclipse.osgi.container.SystemModule.stop(SystemModule.java:186)
at java.lang.Thread.run(Thread.java:785)

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