java.lang.NullPointerException
    at org.eclipse.swt.widgets.TabFolder.minimumSize(TabFolder.java:631)
    at org.eclipse.swt.widgets.Composite.computeSize(Composite.java:245)
    at org.eclipse.swt.widgets.TabFolder.computeSize(TabFolder.java:194)
    at org.eclipse.swt.layout.GridData.computeSize(GridData.java:491)
    at org.eclipse.swt.layout.GridLayout.layout(GridLayout.java:221)
    at org.eclipse.swt.layout.GridLayout.computeSize(GridLayout.java:164)
    at org.eclipse.swt.widgets.Composite.computeSize(Composite.java:239)
    at org.eclipse.swt.custom.ScrolledCompositeLayout.computeSize(ScrolledCompositeLayout.java:33)
    at org.eclipse.swt.widgets.Composite.computeSize(Composite.java:239)
    at org.eclipse.swt.layout.GridData.computeSize(GridData.java:491)
    at org.eclipse.swt.layout.GridLayout.layout(GridLayout.java:221)
    at org.eclipse.swt.layout.GridLayout.computeSize(GridLayout.java:164)
    at org.eclipse.swt.widgets.Composite.computeSize(Composite.java:239)
    at org.eclipse.jface.wizard.WizardDialog$PageContainerFillLayout.computeSize(WizardDialog.java:234)
    at org.eclipse.swt.widgets.Composite.computeSize(Composite.java:239)
    at org.eclipse.swt.layout.GridData.computeSize(GridData.java:491)
    at org.eclipse.swt.layout.GridLayout.layout(GridLayout.java:221)
    at org.eclipse.swt.layout.GridLayout.computeSize(GridLayout.java:164)
    at org.eclipse.swt.widgets.Composite.computeSize(Composite.java:239)
    at org.eclipse.swt.layout.GridData.computeSize(GridData.java:491)
    at org.eclipse.swt.layout.GridLayout.layout(GridLayout.java:221)
    at org.eclipse.swt.layout.GridLayout.computeSize(GridLayout.java:164)
    at org.eclipse.swt.widgets.Composite.computeSize(Composite.java:239)
    at org.eclipse.swt.layout.FormData.computeSize(FormData.java:128)
    at org.eclipse.swt.layout.FormLayout.layout(FormLayout.java:323)
    at org.eclipse.swt.layout.FormLayout.layout(FormLayout.java:289)
    at org.eclipse.swt.widgets.Composite.updateLayout(Composite.java:1668)
    at org.eclipse.swt.widgets.Composite.layout(Composite.java:1020)
    at org.eclipse.swt.widgets.Composite.layout(Composite.java:978)
    at org.eclipse.jface.dialogs.TitleAreaDialog.layoutForNewMessage(TitleAreaDialog.java:499)
    at org.eclipse.jface.dialogs.TitleAreaDialog.showMessage(TitleAreaDialog.java:624)
    at org.eclipse.jface.dialogs.TitleAreaDialog.setMessage(TitleAreaDialog.java:595)
    at org.eclipse.jface.wizard.WizardDialog.updateMessage(WizardDialog.java:1361)
    at org.eclipse.jface.wizard.WizardPage.setMessage(WizardPage.java:275)
    at org.eclipse.jface.dialogs.DialogPage.setMessage(DialogPage.java:413)
    at org.eclipse.ui.internal.dialogs.ImportExportPage.updateSelectedNode(ImportExportPage.java:251)
    at org.eclipse.ui.internal.dialogs.ImportExportPage.listSelectionChanged(ImportExportPage.java:286)
    at org.eclipse.ui.internal.dialogs.ImportPage$1.selectionChanged(ImportPage.java:70)
    at org.eclipse.jface.viewers.Viewer$2.run(Viewer.java:163)
    at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
    at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:50)
    at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:173)
    at org.eclipse.jface.viewers.Viewer.fireSelectionChanged(Viewer.java:160)
    at org.eclipse.jface.viewers.StructuredViewer.updateSelection(StructuredViewer.java:2197)
    at org.eclipse.jface.viewers.StructuredViewer.handleSelect(StructuredViewer.java:1228)
    at org.eclipse.jface.viewers.StructuredViewer$4.widgetSelected(StructuredViewer.java:1257)
    at org.eclipse.jface.util.OpenStrategy.fireSelectionEvent(OpenStrategy.java:242)
    at org.eclipse.jface.util.OpenStrategy.access$4(OpenStrategy.java:236)
    at org.eclipse.jface.util.OpenStrategy$1.handleEvent(OpenStrategy.java:408)
    at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
    at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4481)
    at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1329)
    at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3819)
    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3430)
    at org.eclipse.jface.window.Window.runEventLoop(Window.java:827)
    at org.eclipse.jface.window.Window.open(Window.java:803)
    at org.eclipse.ui.internal.handlers.WizardHandler$Import.executeHandler(WizardHandler.java:158)
    at org.eclipse.ui.internal.handlers.WizardHandler.execute(WizardHandler.java:290)
    at org.eclipse.ui.internal.handlers.HandlerProxy.execute(HandlerProxy.java:295)
    at org.eclipse.ui.internal.handlers.E4HandlerProxy.execute(E4HandlerProxy.java:90)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.eclipse.e4.core.internal.di.MethodRequestor.execute(MethodRequestor.java:56)
    at org.eclipse.e4.core.internal.di.InjectorImpl.invokeUsingClass(InjectorImpl.java:252)
    at org.eclipse.e4.core.internal.di.InjectorImpl.invoke(InjectorImpl.java:234)
    at org.eclipse.e4.core.contexts.ContextInjectionFactory.invoke(ContextInjectionFactory.java:132)
    at org.eclipse.e4.core.commands.internal.HandlerServiceHandler.execute(HandlerServiceHandler.java:152)
    at org.eclipse.core.commands.Command.executeWithChecks(Command.java:493)
    at org.eclipse.core.commands.ParameterizedCommand.executeWithChecks(ParameterizedCommand.java:486)
    at org.eclipse.e4.core.commands.internal.HandlerServiceImpl.executeHandler(HandlerServiceImpl.java:210)
    at org.eclipse.ui.internal.handlers.LegacyHandlerService.executeCommand(LegacyHandlerService.java:343)
    at org.eclipse.ui.internal.actions.CommandAction.runWithEvent(CommandAction.java:160)
    at org.eclipse.ui.internal.actions.CommandAction.run(CommandAction.java:175)
    at org.eclipse.ui.actions.ImportResourcesAction.run(ImportResourcesAction.java:99)
    at org.eclipse.ui.actions.BaseSelectionListenerAction.runWithEvent(BaseSelectionListenerAction.java:170)
    at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:595)
    at org.eclipse.jface.action.ActionContributionItem.access$2(ActionContributionItem.java:511)
    at org.eclipse.jface.action.ActionContributionItem$5.handleEvent(ActionContributionItem.java:420)
    at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
    at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4481)
    at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1329)
    at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3819)
    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3430)
    at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$4.run(PartRenderingEngine.java:1127)
    at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:337)
    at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1018)
    at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:156)
    at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:694)
    at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:337)
    at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:606)
    at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:150)
    at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:139)
    at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
    at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:134)
    at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104)
    at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:380)
    at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:235)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:669)
    at org.eclipse.equinox.launcher.Main.basicRun(Main.java:608)
    at org.eclipse.equinox.launcher.Main.run(Main.java:1515)
    at org.eclipse.equinox.launcher.Main.main(Main.java:1488)