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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)