Plug-in org.python.pydev was unable to load class org.python.pydev.editor.PyEdit
<p>My Eclipse stalled so I shut it down (normally, I didn't send any kill signal or anything, the editor was bugging but the menu was still working so I simply quit it from the menu).</p>

<p>When I reopened eclipse however I got the problem:</p>

<blockquote>
  <p>Plug-in org.python.pydev was unable to load class org.python.pydev.editor.PyEdit.</p>
</blockquote>

<p>I am using Eclipse Kepler Release 2 Build id: 20140224-0627</p>

<p>with Java 8 and</p>

<p>PyDev 4.5.4.20160129223</p>

<p>I have tried rebuilding the workspace, cleaning the workspace, restarting it, but nothing works.  I have now updated PyDev to PyDev 5 and it still gives me the same error.</p>

<p>Additionally, the Package Explorer can't load either and gives the error:</p>

<blockquote>
  <p>Plug-in org.eclipse.jdt.ui was unable to load class org.eclipse.jdt.internal.ui.packageview.PackageExplorerPart.</p>
</blockquote>

<p>Any ideas?</p>

<p>The exact traceback is:</p>

<blockquote>
  <p>org.eclipse.core.runtime.CoreException: Plug-in org.python.pydev was unable to load class org.python.pydev.editor.PyEdit.
      at org.eclipse.core.internal.registry.osgi.RegistryStrategyOSGI.throwException(RegistryStrategyOSGI.java:194)
      at org.eclipse.core.internal.registry.osgi.RegistryStrategyOSGI.createExecutableExtension(RegistryStrategyOSGI.java:178)
      at org.eclipse.core.internal.registry.ExtensionRegistry.createExecutableExtension(ExtensionRegistry.java:905)
      at org.eclipse.core.internal.registry.ConfigurationElement.createExecutableExtension(ConfigurationElement.java:243)
      at org.eclipse.core.internal.registry.ConfigurationElementHandle.createExecutableExtension(ConfigurationElementHandle.java:55)
      at org.eclipse.ui.internal.WorkbenchPlugin.createExtension(WorkbenchPlugin.java:274)
      at org.eclipse.ui.internal.registry.EditorDescriptor.createEditor(EditorDescriptor.java:235)
      at org.eclipse.ui.internal.EditorReference.createPart(EditorReference.java:318)
      at org.eclipse.ui.internal.e4.compatibility.CompatibilityPart.createPart(CompatibilityPart.java:266)
      at org.eclipse.ui.internal.e4.compatibility.CompatibilityEditor.createPart(CompatibilityEditor.java:61)
      at org.eclipse.ui.internal.e4.compatibility.CompatibilityPart.create(CompatibilityPart.java:304)
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
      at java.lang.reflect.Method.invoke(Method.java:497)
      at org.eclipse.e4.core.internal.di.MethodRequestor.execute(MethodRequestor.java:56)
      at org.eclipse.e4.core.internal.di.InjectorImpl.processAnnotated(InjectorImpl.java:877)
      at org.eclipse.e4.core.internal.di.InjectorImpl.processAnnotated(InjectorImpl.java:857)
      at org.eclipse.e4.core.internal.di.InjectorImpl.inject(InjectorImpl.java:119)
      at org.eclipse.e4.core.internal.di.InjectorImpl.internalMake(InjectorImpl.java:333)
      at org.eclipse.e4.core.internal.di.InjectorImpl.make(InjectorImpl.java:254)
      at org.eclipse.e4.core.contexts.ContextInjectionFactory.make(ContextInjectionFactory.java:162)
      at org.eclipse.e4.ui.internal.workbench.ReflectionContributionFactory.createFromBundle(ReflectionContributionFactory.java:102)
      at org.eclipse.e4.ui.internal.workbench.ReflectionContributionFactory.doCreate(ReflectionContributionFactory.java:71)
      at org.eclipse.e4.ui.internal.workbench.ReflectionContributionFactory.create(ReflectionContributionFactory.java:53)
      at org.eclipse.e4.ui.workbench.renderers.swt.ContributedPartRenderer.createWidget(ContributedPartRenderer.java:129)
      at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.createWidget(PartRenderingEngine.java:949)
      at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:633)
      at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:735)
      at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.access$2(PartRenderingEngine.java:706)
      at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$7.run(PartRenderingEngine.java:700)
      at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
      at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.createGui(PartRenderingEngine.java:685)
      at org.eclipse.e4.ui.workbench.renderers.swt.StackRenderer.showTab(StackRenderer.java:1147)
      at org.eclipse.e4.ui.workbench.renderers.swt.LazyStackRenderer.postProcess(LazyStackRenderer.java:96)
      at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:649)
      at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:735)
      at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.access$2(PartRenderingEngine.java:706)
      at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$7.run(PartRenderingEngine.java:700)
      at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
      at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.createGui(PartRenderingEngine.java:685)
      at org.eclipse.e4.ui.workbench.renderers.swt.SWTPartRenderer.processContents(SWTPartRenderer.java:62)
      at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:645)
      at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$6.run(PartRenderingEngine.java:526)
      at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
      at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.createGui(PartRenderingEngine.java:511)
      at org.eclipse.e4.ui.workbench.renderers.swt.ElementReferenceRenderer.createWidget(ElementReferenceRenderer.java:61)
      at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.createWidget(PartRenderingEngine.java:949)
      at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:633)
      at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:735)
      at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.access$2(PartRenderingEngine.java:706)
      at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$7.run(PartRenderingEngine.java:700)
      at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
      at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.createGui(PartRenderingEngine.java:685)
      at org.eclipse.e4.ui.workbench.renderers.swt.SWTPartRenderer.processContents(SWTPartRenderer.java:62)
      at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:645)
      at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:735)
      at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.access$2(PartRenderingEngine.java:706)
      at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$7.run(PartRenderingEngine.java:700)
      at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
      at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.createGui(PartRenderingEngine.java:685)
      at org.eclipse.e4.ui.workbench.renderers.swt.SWTPartRenderer.processContents(SWTPartRenderer.java:62)
      at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:645)
      at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:735)
      at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.access$2(PartRenderingEngine.java:706)
      at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$7.run(PartRenderingEngine.java:700)
      at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
      at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.createGui(PartRenderingEngine.java:685)
      at org.eclipse.e4.ui.workbench.renderers.swt.SWTPartRenderer.processContents(SWTPartRenderer.java:62)
      at org.eclipse.e4.ui.workbench.renderers.swt.PerspectiveRenderer.processContents(PerspectiveRenderer.java:59)
      at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:645)
      at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:735)
      at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.access$2(PartRenderingEngine.java:706)
      at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$7.run(PartRenderingEngine.java:700)
      at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
      at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.createGui(PartRenderingEngine.java:685)
      at org.eclipse.e4.ui.workbench.renderers.swt.PerspectiveStackRenderer.showTab(PerspectiveStackRenderer.java:103)
      at org.eclipse.e4.ui.workbench.renderers.swt.LazyStackRenderer.postProcess(LazyStackRenderer.java:96)
      at org.eclipse.e4.ui.workbench.renderers.swt.PerspectiveStackRenderer.postProcess(PerspectiveStackRenderer.java:77)
      at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:649)
      at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:735)
      at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.access$2(PartRenderingEngine.java:706)
      at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$7.run(PartRenderingEngine.java:700)
      at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
      at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.createGui(PartRenderingEngine.java:685)
      at org.eclipse.e4.ui.workbench.renderers.swt.SWTPartRenderer.processContents(SWTPartRenderer.java:62)
      at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:645)
      at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:735)
      at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.access$2(PartRenderingEngine.java:706)
      at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$7.run(PartRenderingEngine.java:700)
      at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
      at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.createGui(PartRenderingEngine.java:685)
      at org.eclipse.e4.ui.workbench.renderers.swt.SWTPartRenderer.processContents(SWTPartRenderer.java:62)
      at org.eclipse.e4.ui.workbench.renderers.swt.WBWRenderer.processContents(WBWRenderer.java:581)
      at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:645)
      at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:735)
      at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.access$2(PartRenderingEngine.java:706)
      at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$7.run(PartRenderingEngine.java:700)
      at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
      at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.createGui(PartRenderingEngine.java:685)
      at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$9.run(PartRenderingEngine.java:1042)
      at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
      at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:997)
      at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:140)
      at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:611)
      at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
      at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:567)
      at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:150)
      at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:124)
      at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
      at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
      at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
      at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:354)
      at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:181)
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
      at java.lang.reflect.Method.invoke(Method.java:497)
      at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:636)
      at org.eclipse.equinox.launcher.Main.basicRun(Main.java:591)
      at org.eclipse.equinox.launcher.Main.run(Main.java:1450)
      at org.eclipse.equinox.launcher.Main.main(Main.java:1426)
  Caused by: java.lang.NoClassDefFoundError: org/eclipse/ui/editors/text/TextEditor
      at java.lang.ClassLoader.defineClass1(Native Method)
      at java.lang.ClassLoader.defineClass(ClassLoader.java:760)
      at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.defineClass(DefaultClassLoader.java:188)
      at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.defineClassHoldingLock(ClasspathManager.java:638)
      at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.defineClass(ClasspathManager.java:613)
      at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findClassImpl(ClasspathManager.java:574)
      at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClassImpl(ClasspathManager.java:492)
      at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass(ClasspathManager.java:465)
      at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.findLocalClass(DefaultClassLoader.java:216)
      at org.eclipse.osgi.internal.loader.BundleLoader.findLocalClass(BundleLoader.java:395)
      at org.eclipse.osgi.internal.loader.SingleSourcePackage.loadClass(SingleSourcePackage.java:35)
      at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:461)
      at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:421)
      at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:412)
      at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:107)
      at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
      at java.lang.ClassLoader.defineClass1(Native Method)
      at java.lang.ClassLoader.defineClass(ClassLoader.java:760)
      at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.defineClass(DefaultClassLoader.java:188)
      at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.defineClassHoldingLock(ClasspathManager.java:638)
      at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.defineClass(ClasspathManager.java:613)
      at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findClassImpl(ClasspathManager.java:574)
      at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClassImpl(ClasspathManager.java:492)
      at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass(ClasspathManager.java:465)
      at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.findLocalClass(DefaultClassLoader.java:216)
      at org.eclipse.osgi.internal.loader.BundleLoader.findLocalClass(BundleLoader.java:395)
      at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:464)
      at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:421)
      at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:412)
      at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:107)
      at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
      at java.lang.ClassLoader.defineClass1(Native Method)
      at java.lang.ClassLoader.defineClass(ClassLoader.java:760)
      at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.defineClass(DefaultClassLoader.java:188)
      at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.defineClassHoldingLock(ClasspathManager.java:638)
      at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.defineClass(ClasspathManager.java:613)
      at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findClassImpl(ClasspathManager.java:574)
      at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClassImpl(ClasspathManager.java:492)
      at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass(ClasspathManager.java:465)
      at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.findLocalClass(DefaultClassLoader.java:216)
      at org.eclipse.osgi.internal.loader.BundleLoader.findLocalClass(BundleLoader.java:395)
      at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:464)
      at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:421)
      at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:412)
      at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:107)
      at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
      at org.eclipse.osgi.internal.loader.BundleLoader.loadClass(BundleLoader.java:340)
      at org.eclipse.osgi.framework.internal.core.BundleHost.loadClass(BundleHost.java:229)
      at org.eclipse.osgi.framework.internal.core.AbstractBundle.loadClass(AbstractBundle.java:1212)
      at org.eclipse.core.internal.registry.osgi.RegistryStrategyOSGI.createExecutableExtension(RegistryStrategyOSGI.java:174)
      ... 120 more
  Caused by: org.eclipse.core.runtime.internal.adaptor.EclipseLazyStarter$TerminatingClassNotFoundException: An error occurred while automatically activating bundle org.eclipse.ui.editors (216).
      at org.eclipse.core.runtime.internal.adaptor.EclipseLazyStarter.postFindLocalClass(EclipseLazyStarter.java:124)
      at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass(ClasspathManager.java:469)
      at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.findLocalClass(DefaultClassLoader.java:216)
      at org.eclipse.osgi.internal.loader.BundleLoader.findLocalClass(BundleLoader.java:395)
      at org.eclipse.osgi.internal.loader.SingleSourcePackage.loadClass(SingleSourcePackage.java:35)
      at org.eclipse.osgi.internal.loader.MultiSourcePackage.loadClass(MultiSourcePackage.java:31)
      at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:452)
      at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:421)
      at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:412)
      at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:107)
      at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
      at com.laboki.eclipse.plugin.smartsave.main.EditorContext.(EditorContext.java:81)
      at com.laboki.eclipse.plugin.smartsave.task.AsyncTask$1.runTask(AsyncTask.java:17)
      at com.laboki.eclipse.plugin.smartsave.task.TaskJob.run(TaskJob.java:28)
      at org.eclipse.core.internal.jobs.Worker.run(Worker.java:53)
  Caused by: org.osgi.framework.BundleException: Exception in org.eclipse.ui.internal.editors.text.EditorsPlugin.start() of bundle org.eclipse.ui.editors.
      at org.eclipse.osgi.framework.internal.core.BundleContextImpl.startActivator(BundleContextImpl.java:734)
      at org.eclipse.osgi.framework.internal.core.BundleContextImpl.start(BundleContextImpl.java:683)
      at org.eclipse.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.java:381)
      at org.eclipse.osgi.framework.internal.core.AbstractBundle.start(AbstractBundle.java:300)
      at org.eclipse.osgi.framework.util.SecureAction.start(SecureAction.java:478)
      at org.eclipse.osgi.internal.loader.BundleLoader.setLazyTrigger(BundleLoader.java:263)
      at org.eclipse.core.runtime.internal.adaptor.EclipseLazyStarter.postFindLocalClass(EclipseLazyStarter.java:109)
      ... 14 more
  Caused by: org.eclipse.swt.SWTException: Invalid thread access
      at org.eclipse.swt.SWT.error(SWT.java:4397)
      at org.eclipse.swt.SWT.error(SWT.java:4312)
      at org.eclipse.swt.SWT.error(SWT.java:4283)
      at org.eclipse.swt.widgets.Display.error(Display.java:1204)
      at org.eclipse.swt.widgets.Display.checkDevice(Display.java:759)
      at org.eclipse.swt.widgets.Display.disposeExec(Display.java:1181)
      at org.eclipse.jface.resource.ColorRegistry.hookDisplayDispose(ColorRegistry.java:268)
      at org.eclipse.jface.resource.ColorRegistry.(ColorRegistry.java:123)
      at org.eclipse.jface.resource.ColorRegistry.(ColorRegistry.java:106)
      at org.eclipse.ui.internal.themes.WorkbenchThemeManager.(WorkbenchThemeManager.java:98)
      at org.eclipse.ui.internal.themes.WorkbenchThemeManager.getInstance(WorkbenchThemeManager.java:58)
      at org.eclipse.ui.internal.Workbench.getThemeManager(Workbench.java:3232)
      at org.eclipse.ui.internal.editors.text.EditorsPlugin.start(EditorsPlugin.java:214)
      at org.eclipse.osgi.framework.internal.core.BundleContextImpl$1.run(BundleContextImpl.java:711)
      at java.security.AccessController.doPrivileged(Native Method)
      at org.eclipse.osgi.framework.internal.core.BundleContextImpl.startActivator(BundleContextImpl.java:702)
      ... 20 more</p>
</blockquote>