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java.lang.NullPointerException: 	at org.eclipse.jst.pagedesigner.properties.AttributePropertySource.getAttrPropertyDescriptor(AttributePropertySource.java:244)	at org.eclipse.jst.pagedesigner.properties.AttributePropertySource.getPropertyDescriptors(AttributePropertySource.java:208)	at org.eclipse.ui.views.properties.PropertySheetEntry.computeMergedPropertyDescriptors(PropertySheetEntry.java:167)	at org.eclipse.ui.views.properties.PropertySheetEntry.refreshChildEntries(PropertySheetEntry.java:530)	at org.eclipse.ui.views.properties.PropertySheetEntry.setValues(PropertySheetEntry.java:760)	at org.eclipse.ui.views.properties.PropertySheetViewer.setInput(PropertySheetViewer.java:973)	at org.eclipse.ui.views.properties.PropertySheetPage.refresh(PropertySheetPage.java:491)	at org.eclipse.jst.pagedesigner.properties.AllPropertySection.refresh(AllPropertySection.java:128)	at org.eclipse.ui.views.properties.tabbed.TabContents$6.run(TabContents.java:217)	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)	at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:49)	at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:175)	at org.eclipse.ui.views.properties.tabbed.TabContents.refresh(TabContents.java:220)	at org.eclipse.ui.views.properties.tabbed.TabbedPropertySheetPage$SelectionChangedListener.selectionChanged(TabbedPropertySheetPage.java:222)	at org.eclipse.jface.viewers.Viewer$2.run(Viewer.java:164)	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)	at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:49)	at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:175)	at org.eclipse.jface.viewers.Viewer.fireSelectionChanged(Viewer.java:162)	at org.eclipse.jface.viewers.StructuredViewer.updateSelection(StructuredViewer.java:2188)	at org.eclipse.jface.viewers.StructuredViewer.handleSelect(StructuredViewer.java:1211)	at org.eclipse.jface.viewers.StructuredViewer$4.widgetSelected(StructuredViewer.java:1241)	at org.eclipse.jface.util.OpenStrategy.fireSelectionEvent(OpenStrategy.java:239)	at org.eclipse.jface.util.OpenStrategy.access$4(OpenStrategy.java:233)	at org.eclipse.jface.util.OpenStrategy$1.handleEvent(OpenStrategy.java:403)	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)	at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4128)	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1457)	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1480)	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1465)	at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:1270)	at org.eclipse.ui.internal.views.properties.tabbed.view.TabbedPropertyList.select(TabbedPropertyList.java:664)	at org.eclipse.ui.internal.views.properties.tabbed.view.TabbedPropertyList$2.mouseUp(TabbedPropertyList.java:156)	at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:219)	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)	at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4128)	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1457)	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1480)	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1465)	at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:1270)	at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3974)	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3613)	at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2696)	at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2660)	at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2494)	at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:674)	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:667)	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:123)	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:344)	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)	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:622)	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:577)	at org.eclipse.equinox.launcher.Main.run(Main.java:1410)