notifications.impl.descriptors.AbstractParticipantDescriptor ERROR Message When Shutting Down Confluence Service

2014-05-06 21:19:00,577 INFO [localhost-startStop-2] [atlassian.plugin.manager.DefaultPluginManager] shutdown Shutting down the plugin system
2014-05-06 21:19:03,375 ERROR [localhost-startStop-2] [notifications.impl.descriptors.AbstractParticipantDescriptor] disabled RecipientProviderDescriptor is being disabled - debug stack trace : 
java.lang.Throwable
	at com.atlassian.confluence.notifications.impl.descriptors.AbstractParticipantDescriptor.disabled(AbstractParticipantDescriptor.java:44)
	at com.atlassian.plugin.manager.DefaultPluginManager.publishModuleDisabledEvents(DefaultPluginManager.java:1614)
	at com.atlassian.plugin.manager.DefaultPluginManager.notifyModuleDisabled(DefaultPluginManager.java:1601)
	at com.atlassian.confluence.plugin.ConfluencePluginManager.notifyModuleDisabled(ConfluencePluginManager.java:126)
	at com.atlassian.plugin.manager.DefaultPluginManager.onPluginModuleUnavailable(DefaultPluginManager.java:380)
	at sun.reflect.GeneratedMethodAccessor897.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at com.atlassian.event.internal.SingleParameterMethodListenerInvoker.invoke(SingleParameterMethodListenerInvoker.java:36)
	at com.atlassian.event.internal.AsynchronousAbleEventDispatcher$1$1.run(AsynchronousAbleEventDispatcher.java:48)
	at com.google.common.util.concurrent.MoreExecutors$SameThreadExecutorService.execute(MoreExecutors.java:253)
	at com.atlassian.event.internal.AsynchronousAbleEventDispatcher.dispatch(AsynchronousAbleEventDispatcher.java:107)
	at com.atlassian.event.internal.EventPublisherImpl.invokeListeners(EventPublisherImpl.java:160)
	at com.atlassian.event.internal.EventPublisherImpl.publish(EventPublisherImpl.java:79)
	at com.atlassian.plugin.event.impl.DefaultPluginEventManager.broadcast(DefaultPluginEventManager.java:84)
	at com.atlassian.plugin.osgi.factory.UnrecognizedModuleDescriptorServiceTrackerCustomizer.removedService(UnrecognizedModuleDescriptorServiceTrackerCustomizer.java:141)
	at org.osgi.util.tracker.ServiceTracker$Tracked.customizerRemoved(ServiceTracker.java:922)
	at org.osgi.util.tracker.AbstractTracked.untrack(AbstractTracked.java:351)
	at org.osgi.util.tracker.ServiceTracker.close(ServiceTracker.java:403)
	at com.atlassian.plugin.osgi.factory.OsgiPluginInstalledHelper.onDisable(OsgiPluginInstalledHelper.java:105)
	at com.atlassian.plugin.osgi.factory.OsgiPlugin$1.bundleChanged(OsgiPlugin.java:110)
	at org.apache.felix.framework.util.EventDispatcher.invokeBundleListenerCallback(EventDispatcher.java:800)
	at org.apache.felix.framework.util.EventDispatcher.fireEventImmediately(EventDispatcher.java:728)
	at org.apache.felix.framework.util.EventDispatcher.fireBundleEvent(EventDispatcher.java:610)
	at org.apache.felix.framework.Felix.fireBundleEvent(Felix.java:3715)
	at org.apache.felix.framework.Felix.stopBundle(Felix.java:2180)
	at org.apache.felix.framework.Felix.uninstallBundle(Felix.java:2289)
	at org.apache.felix.framework.BundleImpl.uninstall(BundleImpl.java:965)
	at com.atlassian.plugin.osgi.factory.OsgiPlugin.uninstallInternal(OsgiPlugin.java:560)
	at com.atlassian.plugin.impl.AbstractPlugin.uninstall(AbstractPlugin.java:453)
	at com.atlassian.plugin.impl.AbstractDelegatingPlugin.uninstall(AbstractDelegatingPlugin.java:221)
	at com.atlassian.plugin.loaders.ScanningPluginLoader.onShutdown(ScanningPluginLoader.java:275)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at com.atlassian.event.internal.SingleParameterMethodListenerInvoker.invoke(SingleParameterMethodListenerInvoker.java:36)
	at com.atlassian.event.internal.AsynchronousAbleEventDispatcher$1$1.run(AsynchronousAbleEventDispatcher.java:48)
	at com.google.common.util.concurrent.MoreExecutors$SameThreadExecutorService.execute(MoreExecutors.java:253)
	at com.atlassian.event.internal.AsynchronousAbleEventDispatcher.dispatch(AsynchronousAbleEventDispatcher.java:107)
	at com.atlassian.event.internal.EventPublisherImpl.invokeListeners(EventPublisherImpl.java:160)
	at com.atlassian.event.internal.EventPublisherImpl.publish(EventPublisherImpl.java:79)
	at com.atlassian.plugin.event.impl.DefaultPluginEventManager.broadcast(DefaultPluginEventManager.java:84)
	at com.atlassian.plugin.manager.DefaultPluginManager.shutdown(DefaultPluginManager.java:323)
	at com.atlassian.confluence.plugin.PluginFrameworkContextListener.contextDestroyed(PluginFrameworkContextListener.java:71)
	at org.apache.catalina.core.StandardContext.listenerStop(StandardContext.java:4980)
	at org.apache.catalina.core.StandardContext.stopInternal(StandardContext.java:5626)
	at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:232)
	at org.apache.catalina.core.ContainerBase$StopChild.call(ContainerBase.java:1575)
	at org.apache.catalina.core.ContainerBase$StopChild.call(ContainerBase.java:1564)
	at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
	at java.util.concurrent.FutureTask.run(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)