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java.lang.NullPointerException: 	at org.eclipse.swt.widgets.TabFolder.gtk_switch_page(TabFolder.java:570)	at org.eclipse.swt.widgets.Widget.windowProc(Widget.java:2009)	at org.eclipse.swt.widgets.Display.windowProc(Display.java:4723)	at org.eclipse.swt.internal.gtk.OS._gtk_widget_show(Native Method)	at org.eclipse.swt.internal.gtk.OS.gtk_widget_show(OS.java:14774)	at org.eclipse.swt.widgets.TabFolder.createItem(TabFolder.java:311)	at org.eclipse.swt.widgets.TabItem.createWidget(TabItem.java:123)	at org.eclipse.swt.widgets.TabItem.(TabItem.java:75)	at com.jaspersoft.studio.server.publish.wizard.page.DatasourceSelectionPage.createControl(DatasourceSelectionPage.java:69)	at org.eclipse.jface.wizard.Wizard.createPageControls(Wizard.java:175)	at org.eclipse.jface.wizard.WizardDialog.createPageControls(WizardDialog.java:705)	at org.eclipse.jface.wizard.WizardDialog.createContents(WizardDialog.java:597)	at org.eclipse.jface.window.Window.create(Window.java:430)	at org.eclipse.jface.dialogs.Dialog.create(Dialog.java:1096)	at org.eclipse.jface.window.Window.open(Window.java:792)	at com.jaspersoft.studio.server.publish.action.JrxmlPublishAction.publishReportUnit(JrxmlPublishAction.java:173)	at com.jaspersoft.studio.server.publish.action.JrxmlPublishAction$2.run(JrxmlPublishAction.java:104)	at org.eclipse.ui.internal.UILockListener.doPendingWork(UILockListener.java:162)	at org.eclipse.ui.internal.UISynchronizer$3.run(UISynchronizer.java:154)	at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)	at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:135)	at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:3794)	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3433)	at org.eclipse.jface.operation.ModalContext$ModalContextThread.block(ModalContext.java:172)	at org.eclipse.jface.operation.ModalContext.run(ModalContext.java:387)	at org.eclipse.jface.wizard.WizardDialog.run(WizardDialog.java:1002)	at com.jaspersoft.studio.server.publish.wizard.page.RUnitLocationPage.look4SelectedUnit(RUnitLocationPage.java:572)	at com.jaspersoft.studio.server.publish.wizard.page.RUnitLocationPage.access$24(RUnitLocationPage.java:570)	at com.jaspersoft.studio.server.publish.wizard.page.RUnitLocationPage$10.run(RUnitLocationPage.java:534)	at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)	at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:135)	at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:3794)	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3433)	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 com.jaspersoft.studio.rcp.intro.Application.start(Application.java:99)	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)