用myeclipse做项目，突然就弹出报空指针异常的错误提示框
打开日志，日志显示
!ENTRY org.eclipse.wst.sse.ui 4 2 2016-09-30 16:22:29.037 !MESSAGE Problems occurred when invoking code from plug-in: "org.eclipse.wst.sse.ui". !STACK 0 java.lang.NullPointerException at org.eclipse.wst.sse.core.internal.text.BasicStructuredDocumentRegion.getFullText(BasicStructuredDocumentRegion.java:151) at org.eclipse.wst.css.core.internal.document.CSSDeclarationItemParser.getCollapsedText(CSSDeclarationItemParser.java:1092) at org.eclipse.wst.css.core.internal.document.CSSDeclarationItemParser.makeString(CSSDeclarationItemParser.java:873) at org.eclipse.wst.css.core.internal.document.CSSDeclarationItemParser.createStringValue(CSSDeclarationItemParser.java:539) at org.eclipse.wst.css.core.internal.document.CSSDeclarationItemParser.createPrimitiveValue(CSSDeclarationItemParser.java:392) at org.eclipse.wst.css.core.internal.document.CSSDeclarationItemParser.setupValues(CSSDeclarationItemParser.java:1021) at org.eclipse.wst.css.core.internal.document.CSSDeclarationItemParser.setupValues(CSSDeclarationItemParser.java:969) at org.eclipse.wst.css.core.internal.document.CSSStyleDeclItemImpl.setCssValueTextCore(CSSStyleDeclItemImpl.java:260) at org.eclipse.wst.css.core.internal.document.CSSStyleDeclItemImpl.setCssValueText(CSSStyleDeclItemImpl.java:234) at org.eclipse.wst.css.core.internal.document.CSSStyleDeclarationImpl.setProperty(CSSStyleDeclarationImpl.java:267) at org.eclipse.wst.html.core.internal.htmlcss.CSSQueryContext.applyFull(CSSQueryContext.java:73) at org.eclipse.wst.html.core.internal.htmlcss.CSSQueryTraverser.getDeclaration(CSSQueryTraverser.java:56) at org.eclipse.jst.pagedesigner.css2.CSSUtil.getCSSDeclaration(CSSUtil.java:174) at org.eclipse.jst.pagedesigner.css2.style.AbstractStyle.calculateDeclaration(AbstractStyle.java:143) at org.eclipse.jst.pagedesigner.css2.style.AbstractStyle.getDeclaration(AbstractStyle.java:159) at org.eclipse.jst.pagedesigner.css2.style.AbstractStyle.calculateProperty(AbstractStyle.java:201) at org.eclipse.jst.pagedesigner.css2.style.AbstractStyle.getStyleProperty(AbstractStyle.java:124) at org.eclipse.jst.pagedesigner.css2.layout.CSSFigure.paint(CSSFigure.java:272) at org.eclipse.jst.pagedesigner.css2.layout.FlowFigure.paintChildren(FlowFigure.java:147) at org.eclipse.jst.pagedesigner.css2.layout.CSSFigure.paintClientArea(CSSFigure.java:445) at org.eclipse.jst.pagedesigner.css2.layout.CSSFigure.paint(CSSFigure.java:285) at org.eclipse.jst.pagedesigner.css2.layout.FlowFigure.paintChildren(FlowFigure.java:147) at org.eclipse.jst.pagedesigner.css2.layout.FlowFigure.paintClientArea(FlowFigure.java:170) at org.eclipse.draw2d.Figure.paint(Figure.java:1117) at org.eclipse.draw2d.Figure.paintChildren(Figure.java:1167) at org.eclipse.draw2d.Figure.paintClientArea(Figure.java:1202) at org.eclipse.draw2d.Figure.paint(Figure.java:1117) at org.eclipse.draw2d.Figure.paintChildren(Figure.java:1167) at org.eclipse.draw2d.Figure.paintClientArea(Figure.java:1202) at org.eclipse.draw2d.Figure.paint(Figure.java:1117) at org.eclipse.draw2d.Figure.paintChildren(Figure.java:1167) at org.eclipse.draw2d.Figure.paintClientArea(Figure.java:1202) at org.eclipse.draw2d.ScalableLayeredPane.paintClientArea(ScalableLayeredPane.java:94) at org.eclipse.draw2d.Figure.paint(Figure.java:1117) at org.eclipse.draw2d.Figure.paintChildren(Figure.java:1167) at org.eclipse.draw2d.Figure.paintClientArea(Figure.java:1202) at org.eclipse.draw2d.Figure.paint(Figure.java:1117) at org.eclipse.draw2d.Figure.paintChildren(Figure.java:1167) at org.eclipse.draw2d.Figure.paintClientArea(Figure.java:1202) at org.eclipse.draw2d.Viewport.paintClientArea(Viewport.java:160) at org.eclipse.draw2d.Figure.paint(Figure.java:1117) at org.eclipse.draw2d.Figure.paintChildren(Figure.java:1167) at org.eclipse.draw2d.Figure.paintClientArea(Figure.java:1202) at org.eclipse.draw2d.Figure.paint(Figure.java:1117) at org.eclipse.draw2d.DeferredUpdateManager.paint(DeferredUpdateManager.java:165) at org.eclipse.draw2d.LightweightSystem.paint(LightweightSystem.java:203) at org.eclipse.draw2d.LightweightSystem$2.handleEvent(LightweightSystem.java:110) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1057) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1081) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1066) at org.eclipse.swt.widgets.Composite.WM_PAINT(Composite.java:1491) at org.eclipse.swt.widgets.Control.windowProc(Control.java:4668) at org.eclipse.swt.widgets.Canvas.windowProc(Canvas.java:340) at org.eclipse.swt.widgets.Display.windowProc(Display.java:4990) at org.eclipse.swt.internal.win32.OS.RedrawWindow(Native Method) at org.eclipse.swt.widgets.Control.update(Control.java:4437) at org.eclipse.swt.widgets.Control.update(Control.java:4427) at org.eclipse.draw2d.NativeGraphicsSource.getGraphics(NativeGraphicsSource.java:48) at org.eclipse.draw2d.DeferredUpdateManager.getGraphics(DeferredUpdateManager.java:147) at org.eclipse.draw2d.DeferredUpdateManager.repairDamage(DeferredUpdateManager.java:310) at org.eclipse.draw2d.DeferredUpdateManager.performUpdate(DeferredUpdateManager.java:192) at org.eclipse.jst.pagedesigner.viewer.CaretUpdater.updateRangeSelection(CaretUpdater.java:143) at org.eclipse.jst.pagedesigner.viewer.CaretUpdater.updateSelection(CaretUpdater.java:120) at org.eclipse.jst.pagedesigner.viewer.CaretUpdater.selectionChanged(CaretUpdater.java:201) at org.eclipse.gef.ui.parts.AbstractEditPartViewer.fireSelectionChanged(AbstractEditPartViewer.java:247) at org.eclipse.jst.pagedesigner.viewer.HTMLGraphicalViewer.fireSelectionChanged(HTMLGraphicalViewer.java:272) at org.eclipse.jst.pagedesigner.viewer.HTMLGraphicalViewer.setSelection(HTMLGraphicalViewer.java:292) at org.eclipse.jst.pagedesigner.editors.SelectionSynchronizer.textSelectionChanged(SelectionSynchronizer.java:164) at org.eclipse.jst.pagedesigner.editors.HTMLEditor$9.selectionChanged(HTMLEditor.java:573) at org.eclipse.wst.sse.ui.StructuredTextEditor$4.run(StructuredTextEditor.java:593) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.wst.sse.ui.StructuredTextEditor$StructuredSelectionProvider.fireSelectionChanged(StructuredTextEditor.java:591) at org.eclipse.wst.sse.ui.StructuredTextEditor$StructuredSelectionProvider.handlePostSelectionChanged(StructuredTextEditor.java:672) at org.eclipse.wst.sse.ui.StructuredTextEditor$3.selectionChanged(StructuredTextEditor.java:565) at org.eclipse.jface.text.TextViewer.firePostSelectionChanged(TextViewer.java:2755) at org.eclipse.jface.text.TextViewer.firePostSelectionChanged(TextViewer.java:2703) at org.eclipse.jface.text.TextViewer$5.run(TextViewer.java:2682) at org.eclipse.swt.widgets.Display.runTimer(Display.java:4271) at org.eclipse.swt.widgets.Display.messageProc(Display.java:3358) at org.eclipse.swt.internal.win32.OS.DispatchMessageW(Native Method) at org.eclipse.swt.internal.win32.OS.DispatchMessage(OS.java:2549) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3757) at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$9.run(PartRenderingEngine.java:1113) 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:138) at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:610) 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:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) 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) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at com.genuitec.pulse.eclipse.launcher.Main.main(Main.java:110)
这是什么原因，是软件的bug吗？求大神指点，在下不胜感激
删除工作空间里的
/.metadata/.plugins/org.eclipse.core.runtime/.settings/com.genuitec.eclipse.ast.deploy.core.prefs
的文件 (这个文件中存储了一些部署项目的信息。删了这个部署的项目的信息就没有错误了)，重启MyEclipse