Error while trying to run the Eclipse plugin

Question

I get the following error when I run my Eclipse plugin, it was working fine and not it's not even running .. It says that the 'Activator' class is not find

Here is the exact error

> !SESSION 2013年06月14日 16:41:34.482
> ----------------------------------------------- eclipse.buildId=M20130204-1200 java.version=1.6.0_45 java.vendor=Apple
> Inc. BootLoader constants: OS=macosx, ARCH=x86_64, WS=cocoa, NL=en_US
> Framework arguments: -product org.eclipse.sdk.ide Command-line
> arguments: -product org.eclipse.sdk.ide -data
> /Users/home/Documents/workspace/../runtime-EclipseApplication -dev
> file:/Users/home/Documents/workspace/.metadata/.plugins/org.eclipse.pde.core/Eclipse
> Application/dev.properties -os macosx -ws cocoa -arch x86_64
> -consoleLog
> 
> !ENTRY org.eclipse.core.resources 2 10035 2013年06月14日 16:41:40.698
> !MESSAGE The workspace exited with unsaved changes in the previous
> session; refreshing workspace to recover changes.
> 
> !ENTRY org.eclipse.core.net 1 0 2013年06月14日 16:41:46.963 !MESSAGE
> System property http.nonProxyHosts has been set to
> local|*.local|169.254/16|*.169.254/16 by an external source. This
> value will be overwritten using the values from the preferences
> 
> !ENTRY org.eclipse.ui 4 4 2013年06月14日 16:41:48.397 !MESSAGE Unable to
> find Action Set: TrialProject.actionSet
> 
> !ENTRY org.eclipse.ui 4 4 2013年06月14日 16:41:48.398 !MESSAGE Unable to
> find Action Set: Bachelor.actionSet
> 
> !ENTRY org.eclipse.ui 4 4 2013年06月14日 16:41:48.398 !MESSAGE Unable to
> find Action Set: Bachelor.workbenchActionSet
> 
> !ENTRY org.eclipse.ui 4 4 2013年06月14日 16:41:51.717 !MESSAGE Unable to
> create part
> 
> !ENTRY org.eclipse.core.filebuffers 4 0 2013年06月14日 16:41:51.719
> !MESSAGE The file does not exist. !STACK 1
> org.eclipse.core.runtime.CoreException: The file does not exist. at
> org.eclipse.core.internal.filebuffers.ResourceFileBuffer.create(ResourceFileBuffer.java:237)
> at
> org.eclipse.core.internal.filebuffers.TextFileBufferManager.connect(TextFileBufferManager.java:112)
> at
> org.eclipse.ui.editors.text.TextFileDocumentProvider.createFileInfo(TextFileDocumentProvider.java:559)
> at
> org.eclipse.jdt.internal.ui.javaeditor.CompilationUnitDocumentProvider.createFileInfo(CompilationUnitDocumentProvider.java:978)
> at
> org.eclipse.ui.editors.text.TextFileDocumentProvider.connect(TextFileDocumentProvider.java:478)
> at
> org.eclipse.jdt.internal.ui.javaeditor.CompilationUnitDocumentProvider.connect(CompilationUnitDocumentProvider.java:1242)
> at
> org.eclipse.ui.texteditor.AbstractTextEditor.doSetInput(AbstractTextEditor.java:4222)
> at
> org.eclipse.ui.texteditor.StatusTextEditor.doSetInput(StatusTextEditor.java:237)
> at
> org.eclipse.ui.texteditor.AbstractDecoratedTextEditor.doSetInput(AbstractDecoratedTextEditor.java:1480)
> at
> org.eclipse.jdt.internal.ui.javaeditor.JavaEditor.internalDoSetInput(JavaEditor.java:2584)
> at
> org.eclipse.jdt.internal.ui.javaeditor.JavaEditor.doSetInput(JavaEditor.java:2557)
> at
> org.eclipse.jdt.internal.ui.javaeditor.CompilationUnitEditor.doSetInput(CompilationUnitEditor.java:1395)
> at
> org.eclipse.ui.texteditor.AbstractTextEditor19ドル.run(AbstractTextEditor.java:3209)
> at
> org.eclipse.ui.internal.WorkbenchWindow.run(WorkbenchWindow.java:1667)
> at
> org.eclipse.ui.texteditor.AbstractTextEditor.internalInit(AbstractTextEditor.java:3227)
> at
> org.eclipse.ui.texteditor.AbstractTextEditor.init(AbstractTextEditor.java:3254)
> at
> org.eclipse.ui.internal.EditorReference.initialize(EditorReference.java:360)
> at
> org.eclipse.ui.internal.e4.compatibility.CompatibilityPart.create(CompatibilityPart.java:301)
> 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.e4.core.internal.di.MethodRequestor.execute(MethodRequestor.java:56)
> at
> org.eclipse.e4.core.internal.di.InjectorImpl.processAnnotated(InjectorImpl.java:861)
> at
> org.eclipse.e4.core.internal.di.InjectorImpl.processAnnotated(InjectorImpl.java:841)
> at
> org.eclipse.e4.core.internal.di.InjectorImpl.inject(InjectorImpl.java:113)
> at
> org.eclipse.e4.core.internal.di.InjectorImpl.internalMake(InjectorImpl.java:321)
> at
> org.eclipse.e4.core.internal.di.InjectorImpl.make(InjectorImpl.java:242)
> at
> org.eclipse.e4.core.contexts.ContextInjectionFactory.make(ContextInjectionFactory.java:161)
> 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:141)
> at
> org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.createWidget(PartRenderingEngine.java:894)
> at
> org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:629)
> at
> org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:731)
> at
> org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.access2ドル(PartRenderingEngine.java:702)
> at
> org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine7ドル.run(PartRenderingEngine.java:696)
> at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at
> org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.createGui(PartRenderingEngine.java:681)
> at
> org.eclipse.e4.ui.workbench.renderers.swt.StackRenderer.showTab(StackRenderer.java:1115)
> at
> org.eclipse.e4.ui.workbench.renderers.swt.LazyStackRenderer.postProcess(LazyStackRenderer.java:98)
> 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:731)
> at
> org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.access2ドル(PartRenderingEngine.java:702)
> at
> org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine7ドル.run(PartRenderingEngine.java:696)
> at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at
> org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.createGui(PartRenderingEngine.java:681)
> at
> org.eclipse.e4.ui.workbench.renderers.swt.SWTPartRenderer.processContents(SWTPartRenderer.java:59)
> at
> org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:641)
> at
> org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine6ドル.run(PartRenderingEngine.java:520)
> at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at
> org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.createGui(PartRenderingEngine.java:505)
> at
> org.eclipse.e4.ui.workbench.renderers.swt.ElementReferenceRenderer.createWidget(ElementReferenceRenderer.java:74)
> at
> org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.createWidget(PartRenderingEngine.java:894)
> at
> org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:629)
> at
> org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:731)
> at
> org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.access2ドル(PartRenderingEngine.java:702)
> at
> org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine7ドル.run(PartRenderingEngine.java:696)
> at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at
> org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.createGui(PartRenderingEngine.java:681)
> at
> org.eclipse.e4.ui.workbench.renderers.swt.SWTPartRenderer.processContents(SWTPartRenderer.java:59)
> at
> org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:641)
> at
> org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:731)
> at
> org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.access2ドル(PartRenderingEngine.java:702)
> at
> org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine7ドル.run(PartRenderingEngine.java:696)
> at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at
> org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.createGui(PartRenderingEngine.java:681)
> at
> org.eclipse.e4.ui.workbench.renderers.swt.SWTPartRenderer.processContents(SWTPartRenderer.java:59)
> at
> org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:641)
> at
> org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:731)
> at
> org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.access2ドル(PartRenderingEngine.java:702)
> at
> org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine7ドル.run(PartRenderingEngine.java:696)
> at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at
> org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.createGui(PartRenderingEngine.java:681)
> at
> org.eclipse.e4.ui.workbench.renderers.swt.SWTPartRenderer.processContents(SWTPartRenderer.java:59)
> at
> org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:641)
> at
> org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:731)
> at
> org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.access2ドル(PartRenderingEngine.java:702)
> at
> org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine7ドル.run(PartRenderingEngine.java:696)
> at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at
> org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.createGui(PartRenderingEngine.java:681)
> at
> org.eclipse.e4.ui.workbench.renderers.swt.SWTPartRenderer.processContents(SWTPartRenderer.java:59)
> 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:641)
> at
> org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:731)
> at
> org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.access2ドル(PartRenderingEngine.java:702)
> at
> org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine7ドル.run(PartRenderingEngine.java:696)
> at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at
> org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.createGui(PartRenderingEngine.java:681)
> 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:98)
> 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:645)
> at
> org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:731)
> at
> org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.access2ドル(PartRenderingEngine.java:702)
> at
> org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine7ドル.run(PartRenderingEngine.java:696)
> at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at
> org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.createGui(PartRenderingEngine.java:681)
> at
> org.eclipse.e4.ui.workbench.renderers.swt.SWTPartRenderer.processContents(SWTPartRenderer.java:59)
> at
> org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:641)
> at
> org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:731)
> at
> org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.access2ドル(PartRenderingEngine.java:702)
> at
> org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine7ドル.run(PartRenderingEngine.java:696)
> at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at
> org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.createGui(PartRenderingEngine.java:681)
> at
> org.eclipse.e4.ui.workbench.renderers.swt.SWTPartRenderer.processContents(SWTPartRenderer.java:59)
> at
> org.eclipse.e4.ui.workbench.renderers.swt.WBWRenderer.processContents(WBWRenderer.java:644)
> at
> org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:641)
> at
> org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:731)
> at
> org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.access2ドル(PartRenderingEngine.java:702)
> at
> org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine7ドル.run(PartRenderingEngine.java:696)
> at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at
> org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.createGui(PartRenderingEngine.java:681)
> at
> org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine9ドル.run(PartRenderingEngine.java:987)
> 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.Workbench5ドル.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(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: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) !SUBENTRY 1
> org.eclipse.core.filebuffers 4 0 2013年06月14日 16:41:51.721 !MESSAGE The
> file does not exist.

• CPerkins: What eclipse plugin? There are at least dozens.
• student1234: What do you mean by which Eclipse plugin ?
• student1234: I'm creating a menu that has 2 menu items Compile and Run and I'm trying to run Java code in German
• CPerkins: I mean which plugin are you trying to run? Your question title is "Error while trying to run the Eclipse plugin"
• student1234: The plugin I developed .. I can't understand the question

Answer 1

It looks to me as though you created a file via an editor, then closed the workspace without saving the file. Before bringing up the workspace again, the file was deleted (or perhaps was never saved) and the editor is having problems because the file it was working on is no longer there.