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org.eclipse.core.runtime.AssertionFailedException: null argument:	at org.eclipse.core.runtime.Assert.isNotNull(Assert.java:85)	at org.eclipse.core.runtime.Assert.isNotNull(Assert.java:73)	at org.eclipse.core.internal.runtime.AdapterManager.getAdapter(AdapterManager.java:290)	at org.eclipse.ui.actions.SelectionListenerAction.computeResources(SelectionListenerAction.java:143)	at org.eclipse.ui.actions.SelectionListenerAction.getSelectedResources(SelectionListenerAction.java:227)	at org.eclipse.ui.actions.BuildAction.getBuildConfigurationsToBuild(BuildAction.java:193)	at org.eclipse.ui.actions.BuildAction.getProjectsToBuild(BuildAction.java:174)	at org.eclipse.ui.actions.BuildAction.updateSelection(BuildAction.java:336)	at org.eclipse.ui.actions.BaseSelectionListenerAction.selectionChanged(BaseSelectionListenerAction.java:124)	at org.eclipse.ui.actions.BuildAction.isEnabled(BuildAction.java:239)	at org.eclipse.ui.actions.RetargetAction.setActionHandler(RetargetAction.java:273)	at org.eclipse.ui.internal.ide.actions.RetargetActionWithDefault.setActionHandler(RetargetActionWithDefault.java:47)	at org.eclipse.ui.actions.RetargetAction.partActivated(RetargetAction.java:155)	at org.eclipse.ui.internal.PartListenerList$1.run(PartListenerList.java:72)	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)	at org.eclipse.core.runtime.Platform.run(Platform.java:888)	at org.eclipse.ui.internal.PartListenerList.fireEvent(PartListenerList.java:57)	at org.eclipse.ui.internal.PartListenerList.firePartActivated(PartListenerList.java:70)	at org.eclipse.ui.internal.PartService.firePartActivated(PartService.java:187)	at org.eclipse.ui.internal.PartService.setActivePart(PartService.java:306)	at org.eclipse.ui.internal.WWinPartService.updateActivePart(WWinPartService.java:134)	at org.eclipse.ui.internal.WWinPartService.access$0(WWinPartService.java:125)	at org.eclipse.ui.internal.WWinPartService$WWinListener.partDeactivated(WWinPartService.java:50)	at org.eclipse.ui.internal.PartListenerList2$4.run(PartListenerList2.java:115)	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)	at org.eclipse.core.runtime.Platform.run(Platform.java:888)	at org.eclipse.ui.internal.PartListenerList2.fireEvent(PartListenerList2.java:55)	at org.eclipse.ui.internal.PartListenerList2.firePartDeactivated(PartListenerList2.java:113)	at org.eclipse.ui.internal.PartService.firePartDeactivated(PartService.java:242)	at org.eclipse.ui.internal.PartService.setActivePart(PartService.java:300)	at org.eclipse.ui.internal.WorkbenchPagePartList.fireActivePartChanged(WorkbenchPagePartList.java:57)	at org.eclipse.ui.internal.PartList.setActivePart(PartList.java:136)	at org.eclipse.ui.internal.WorkbenchPage.setActivePart(WorkbenchPage.java:3636)	at org.eclipse.ui.internal.WorkbenchPage.requestActivation(WorkbenchPage.java:3159)	at org.eclipse.ui.internal.PartPane.requestActivation(PartPane.java:279)	at org.eclipse.ui.internal.EditorPane.requestActivation(EditorPane.java:98)	at org.eclipse.ui.internal.presentations.PresentablePart.setFocus(PresentablePart.java:192)	at org.eclipse.ui.internal.presentations.util.TabbedStackPresentation$1.handleEvent(TabbedStackPresentation.java:94)	at org.eclipse.ui.internal.presentations.util.AbstractTabFolder.fireEvent(AbstractTabFolder.java:269)	at org.eclipse.ui.internal.presentations.util.AbstractTabFolder.fireEvent(AbstractTabFolder.java:274)	at org.eclipse.ui.internal.presentations.util.AbstractTabFolder.handleMouseDown(AbstractTabFolder.java:344)	at org.eclipse.ui.internal.presentations.util.AbstractTabFolder$3.mouseDown(AbstractTabFolder.java:78)	at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:191)	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:4165)	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3754)	at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2701)	at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2665)	at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2499)	at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:679)	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:668)	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(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:622)	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:577)	at org.eclipse.equinox.launcher.Main.run(Main.java:1410)