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org.eclipse.core.runtime.AssertionFailedException: null argument:	at org.eclipse.core.runtime.Assert.isNotNull(Assert.java:85)	at org.eclipse.core.runtime.Assert.isNotNull(Assert.java:73)	at org.eclipse.core.internal.events.ResourceChangeListenerList.remove(ResourceChangeListenerList.java:146)	at org.eclipse.core.internal.events.NotificationManager.removeListener(NotificationManager.java:305)	at org.eclipse.core.internal.resources.Workspace.removeResourceChangeListener(Workspace.java:2302)	at org.springframework.ide.eclipse.beans.core.internal.model.BeansModel.stop(BeansModel.java:165)	at org.springframework.ide.eclipse.beans.core.BeansCorePlugin.stop(BeansCorePlugin.java:195)	at org.eclipse.osgi.framework.internal.core.BundleContextImpl$2.run(BundleContextImpl.java:771)	at java.security.AccessController.doPrivileged(Native Method)	at org.eclipse.osgi.framework.internal.core.BundleContextImpl.stop(BundleContextImpl.java:764)	at org.eclipse.osgi.framework.internal.core.BundleHost.stopWorker(BundleHost.java:510)	at org.eclipse.osgi.framework.internal.core.AbstractBundle.suspend(AbstractBundle.java:566)	at org.eclipse.osgi.framework.internal.core.Framework.suspendBundle(Framework.java:1206)	at org.eclipse.osgi.framework.internal.core.StartLevelManager.decFWSL(StartLevelManager.java:592)	at org.eclipse.osgi.framework.internal.core.StartLevelManager.doSetStartLevel(StartLevelManager.java:257)	at org.eclipse.osgi.framework.internal.core.StartLevelManager.shutdown(StartLevelManager.java:215)	at org.eclipse.osgi.framework.internal.core.InternalSystemBundle.suspend(InternalSystemBundle.java:284)	at org.eclipse.osgi.framework.internal.core.Framework.shutdown(Framework.java:692)	at org.eclipse.osgi.framework.internal.core.Framework.close(Framework.java:600)	at org.eclipse.core.runtime.adaptor.EclipseStarter.shutdown(EclipseStarter.java:399)	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:199)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:629)	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:584)	at org.eclipse.equinox.launcher.Main.run(Main.java:1438)	at org.eclipse.equinox.launcher.Main.main(Main.java:1414)