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This exception has no message.
java.lang.NullPointerException: 	at com.ibm.rcp.ui.internal.shelf.ShelfViewReference.createPartHelper(Unknown Source)	at com.ibm.rcp.ui.internal.shelf.ShelfViewReference.createPart(Unknown Source)	at org.eclipse.ui.internal.WorkbenchPartReference.getPart(Unknown Source)	at com.ibm.rcp.ui.shelf.ShelfPage.activatePart(Unknown Source)	at com.ibm.rcp.ui.shelf.ShelfPage.access$13(Unknown Source)	at com.ibm.rcp.ui.shelf.ShelfPage$15.handleEvent(Unknown Source)	at org.eclipse.swt.widgets.EventTable.sendEvent(Unknown Source)	at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source)	at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source)	at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source)	at org.eclipse.swt.widgets.Widget.notifyListeners(Unknown Source)	at com.ibm.rcp.swt.swidgets.SViewForm.internalSetMaximized(Unknown Source)	at com.ibm.rcp.swt.swidgets.SViewStack.updateExpandedStates(Unknown Source)	at com.ibm.rcp.swt.swidgets.SViewStack.setCollapsed(Unknown Source)	at com.ibm.rcp.swt.swidgets.SViewStack$5.handleEvent(Unknown Source)	at org.eclipse.swt.widgets.EventTable.sendEvent(Unknown Source)	at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source)	at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source)	at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source)	at org.eclipse.swt.widgets.Widget.notifyListeners(Unknown Source)	at com.ibm.rcp.swt.swidgets.SViewForm.internalSetCollapsed(Unknown Source)	at com.ibm.rcp.swt.swidgets.SViewForm.setCollapsed(Unknown Source)	at com.ibm.rcp.ui.internal.presentations.ShelfStackPresentation.restoreState(Unknown Source)	at com.ibm.rcp.ui.internal.presentations.ShelfStackPresentation.addPart(Unknown Source)	at com.ibm.rcp.ui.shelf.ShelfPage.createViewForm(Unknown Source)	at com.ibm.rcp.ui.shelf.ShelfPage.addShelfView(Unknown Source)	at com.ibm.rcp.ui.shelf.ShelfPage.init(Unknown Source)	at com.ibm.rcp.ui.shelf.ShelfPage.access$44(Unknown Source)	at com.ibm.rcp.ui.shelf.ShelfPage$3$2.runInUIThread(Unknown Source)	at org.eclipse.ui.progress.UIJob$1.run(Unknown Source)	at org.eclipse.swt.widgets.RunnableLock.run(Unknown Source)	at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Unknown Source)	at org.eclipse.swt.widgets.Display.runAsyncMessages(Unknown Source)	at org.eclipse.swt.widgets.Display.readAndDispatch(Unknown Source)	at org.eclipse.ui.application.WorkbenchAdvisor.openWindows(Unknown Source)	at com.ibm.rcp.personality.framework.internal.RCPWorkbenchAdvisor.openWindows(Unknown Source)	at org.eclipse.ui.internal.Workbench$27.runWithException(Unknown Source)	at org.eclipse.ui.internal.StartupThreading$StartupRunnable.run(Unknown Source)	at org.eclipse.swt.widgets.Synchronizer.syncExec(Unknown Source)	at org.eclipse.ui.internal.UISynchronizer.syncExec(Unknown Source)	at org.eclipse.swt.widgets.Display.syncExec(Unknown Source)	at org.eclipse.ui.internal.StartupThreading.runWithoutExceptions(Unknown Source)	at org.eclipse.ui.internal.Workbench.init(Unknown Source)	at org.eclipse.ui.internal.Workbench.runUI(Unknown Source)	at org.eclipse.ui.internal.Workbench.access$4(Unknown Source)	at org.eclipse.ui.internal.Workbench$5.run(Unknown Source)	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Unknown Source)	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Unknown Source)	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(Unknown Source)	at com.ibm.rcp.personality.framework.internal.RCPApplication.run(Unknown Source)	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.internal.app.EclipseAppContainer.callMethodWithException(Unknown Source)	at org.eclipse.equinox.internal.app.EclipseAppHandle.run(Unknown Source)	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(Unknown Source)	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(Unknown Source)	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(Unknown Source)	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(Unknown Source)	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(Unknown Source)	at org.eclipse.equinox.launcher.Main.basicRun(Unknown Source)	at org.eclipse.equinox.launcher.Main.run(Unknown Source)	at com.ibm.rcp.core.internal.launcher.Main.startLaunch(Unknown Source)	at com.ibm.rcp.core.internal.launcher.Main.main(Unknown Source)	at com.ibm.rcp.core.internal.launcher.Main.run(Unknown Source)