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java.lang.NullPointerException: 	at org.eclipse.ui.internal.navigator.resources.actions.WorkingSetActionProvider.initWorkingSetFilter(WorkingSetActionProvider.java:252)	at org.eclipse.ui.internal.navigator.resources.actions.WorkingSetActionProvider.restoreState(WorkingSetActionProvider.java:323)	at org.eclipse.ui.navigator.NavigatorActionService.initialize(NavigatorActionService.java:372)	at org.eclipse.ui.navigator.NavigatorActionService.getActionProviderInstance(NavigatorActionService.java:355)	at org.eclipse.ui.navigator.NavigatorActionService.fillActionBars(NavigatorActionService.java:253)	at org.eclipse.ui.navigator.CommonNavigatorManager.selectionChanged(CommonNavigatorManager.java:239)	at org.eclipse.jface.viewers.Viewer$2.run(Viewer.java:162)	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)	at org.eclipse.core.runtime.Platform.run(Platform.java:888)	at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:48)	at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:175)	at org.eclipse.jface.viewers.Viewer.fireSelectionChanged(Viewer.java:160)	at org.eclipse.jface.viewers.StructuredViewer.updateSelection(StructuredViewer.java:2132)	at org.eclipse.jface.viewers.StructuredViewer.setSelection(StructuredViewer.java:1669)	at org.eclipse.jface.viewers.TreeViewer.setSelection(TreeViewer.java:1124)	at org.eclipse.ui.navigator.CommonViewer.setSelection(CommonViewer.java:382)	at org.python.pydev.navigator.PyPackageStateSaver.restoreState(PyPackageStateSaver.java:95)	at org.python.pydev.navigator.PythonModelProvider.restoreState(PythonModelProvider.java:245)	at org.eclipse.ui.internal.navigator.extensions.SafeDelegateTreeContentProvider.restoreState(SafeDelegateTreeContentProvider.java:155)	at org.eclipse.ui.internal.navigator.extensions.NavigatorContentExtension.applyMemento(NavigatorContentExtension.java:330)	at org.eclipse.ui.internal.navigator.extensions.NavigatorContentExtension.restoreState(NavigatorContentExtension.java:311)	at org.eclipse.ui.internal.navigator.NavigatorContentService$1.run(NavigatorContentService.java:941)	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)	at org.eclipse.ui.internal.navigator.NavigatorContentService.restoreState(NavigatorContentService.java:956)	at org.python.pydev.navigator.ui.PydevPackageExplorer.createPartControl(PydevPackageExplorer.java:171)