NullPointerException in eclipse in Eclipse itself at PartServiceImpl.internalFixContext

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I have a problem about eclipse IDE, I can't open any file in my work space; if I try to open file, eclipse will alert the following error dialog

"An error has occurred. See error log for more details. java.lang.NullPointerException"

I go to see .log file in .meta at workspace and I see a paragraph in the file like this:

!ENTRY org.eclipse.jface 4 2 2557-04-09 11:40:49.422 !MESSAGE Problems occurred when invoking code from plug-in: "org.eclipse.jface". !STACK 0 java.lang.NullPointerException     at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.internalFixContext(PartServiceImpl.java:380)     at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.bringToTop(PartServiceImpl.java:341)     at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.showPart(PartServiceImpl.java:1029)     at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditor(WorkbenchPage.java:3047)     at org.eclipse.ui.internal.WorkbenchPage.access$22(WorkbenchPage.java:2969)     at org.eclipse.ui.internal.WorkbenchPage$8.run(WorkbenchPage.java:2951)     at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)     at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2947)     at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2911)     at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2902)     at org.eclipse.ui.ide.IDE.openEditor(IDE.java:655)     at org.eclipse.ui.ide.IDE.openEditor(IDE.java:614)     at org.eclipse.jdt.internal.ui.javaeditor.EditorUtility.openInEditor(EditorUtility.java:360)     at org.eclipse.jdt.internal.ui.javaeditor.EditorUtility.openInEditor(EditorUtility.java:167)     at org.eclipse.jdt.ui.actions.OpenAction.run(OpenAction.java:249)     at org.eclipse.jdt.ui.actions.OpenAction.run(OpenAction.java:228)     at org.eclipse.jdt.ui.actions.SelectionDispatchAction.dispatchRun(SelectionDispatchAction.java:275)     at org.eclipse.jdt.ui.actions.SelectionDispatchAction.run(SelectionDispatchAction.java:251)     at org.eclipse.jdt.internal.ui.packageview.PackageExplorerActionGroup.handleOpen(PackageExplorerActionGroup.java:376)     at org.eclipse.jdt.internal.ui.packageview.PackageExplorerPart$4.open(PackageExplorerPart.java:538)     at org.eclipse.ui.OpenAndLinkWithEditorHelper$InternalListener.open(OpenAndLinkWithEditorHelper.java:48)     at org.eclipse.jface.viewers.StructuredViewer$2.run(StructuredViewer.java:866)     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.StructuredViewer.fireOpen(StructuredViewer.java:864)     at org.eclipse.jface.viewers.StructuredViewer.handleOpen(StructuredViewer.java:1152)     at org.eclipse.jface.viewers.StructuredViewer$6.handleOpen(StructuredViewer.java:1256)     at org.eclipse.jface.util.OpenStrategy.fireOpenEvent(OpenStrategy.java:275)     at org.eclipse.jface.util.OpenStrategy.access$2(OpenStrategy.java:269)     at org.eclipse.jface.util.OpenStrategy$1.handleEvent(OpenStrategy.java:309)     at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)     at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1053)     at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4169)     at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3758)     at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$9.run(PartRenderingEngine.java:1053)     at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)     at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:942)     at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:86)     at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:588)     at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)     at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:543)     at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)     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:353)     at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:180)     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:629)     at org.eclipse.equinox.launcher.Main.basicRun(Main.java:584)     at org.eclipse.equinox.launcher.Main.run(Main.java:1438)     at org.eclipse.equinox.launcher.Main.main(Main.java:1414)

How can I solve this problem - any idea?