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java.util.ConcurrentModificationException: 	at java.util.HashMap$HashIterator.nextEntry(Unknown Source)	at java.util.HashMap$ValueIterator.next(Unknown Source)	at java.util.Collections$UnmodifiableCollection$1.next(Unknown Source)	at org.eclipse.ui.internal.navigator.NavigatorContentService.restoreState(NavigatorContentService.java:883)	at org.eclipse.ui.navigator.CommonNavigator.createPartControl(CommonNavigator.java:191)	at org.python.pydev.navigator.ui.PydevPackageExplorer.createPartControl(PydevPackageExplorer.java:126)	at org.eclipse.ui.internal.ViewReference.createPartHelper(ViewReference.java:370)	at org.eclipse.ui.internal.ViewReference.createPart(ViewReference.java:227)	at org.eclipse.ui.internal.WorkbenchPartReference.getPart(WorkbenchPartReference.java:592)	at org.eclipse.ui.internal.PartPane.setVisible(PartPane.java:299)	at org.eclipse.ui.internal.ViewPane.setVisible(ViewPane.java:531)	at org.eclipse.ui.internal.presentations.PresentablePart.setVisible(PresentablePart.java:179)	at org.eclipse.ui.internal.presentations.util.PresentablePartFolder.select(PresentablePartFolder.java:268)	at org.eclipse.ui.internal.presentations.util.LeftToRightTabOrder.select(LeftToRightTabOrder.java:65)	at org.eclipse.ui.internal.presentations.util.TabbedStackPresentation.selectPart(TabbedStackPresentation.java:400)	at org.eclipse.ui.internal.PartStack.refreshPresentationSelection(PartStack.java:1256)	at org.eclipse.ui.internal.PartStack.createControl(PartStack.java:668)	at org.eclipse.ui.internal.PartStack.createControl(PartStack.java:576)	at org.eclipse.ui.internal.PartSashContainer.createControl(PartSashContainer.java:563)	at org.eclipse.ui.internal.PerspectiveHelper.activate(PerspectiveHelper.java:270)	at org.eclipse.ui.internal.Perspective.onActivate(Perspective.java:931)	at org.eclipse.ui.internal.WorkbenchPage.onActivate(WorkbenchPage.java:2497)	at org.eclipse.ui.internal.WorkbenchWindow$23.run(WorkbenchWindow.java:2837)	at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:67)	at org.eclipse.ui.internal.WorkbenchWindow.setActivePage(WorkbenchWindow.java:2818)	at org.eclipse.ui.internal.WorkbenchWindow$17.runWithException(WorkbenchWindow.java:2135)	at org.eclipse.ui.internal.StartupThreading$StartupRunnable.run(StartupThreading.java:31)	at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)	at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:123)	at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:3659)	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3296)	at org.eclipse.ui.application.WorkbenchAdvisor.openWindows(WorkbenchAdvisor.java:797)	at org.eclipse.ui.internal.Workbench$25.runWithException(Workbench.java:1342)	at org.eclipse.ui.internal.StartupThreading$StartupRunnable.run(StartupThreading.java:31)	at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)	at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:123)	at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:3659)	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3296)	at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2309)	at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2219)	at org.eclipse.ui.internal.Workbench$4.run(Workbench.java:466)	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:289)	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:461)	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:106)	at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:153)	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:106)	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:76)	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:363)	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:176)	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 org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:504)	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:443)	at org.eclipse.equinox.launcher.Main.run(Main.java:1169)