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org.eclipse.swt.SWTException: Widget is disposed	at org.eclipse.swt.SWT.error(Unknown Source)	at org.eclipse.swt.SWT.error(Unknown Source)	at org.eclipse.swt.SWT.error(Unknown Source)	at org.eclipse.swt.widgets.Widget.error(Unknown Source)	at org.eclipse.swt.widgets.Widget.checkWidget(Unknown Source)	at org.eclipse.swt.widgets.Control.getParent(Unknown Source)	at org.eclipse.swt.widgets.Shell.getShells(Unknown Source)	at org.eclipse.swt.widgets.Shell.releaseChildren(Unknown Source)	at org.eclipse.swt.widgets.Widget.release(Unknown Source)	at org.eclipse.swt.widgets.Control.release(Unknown Source)	at org.eclipse.swt.widgets.Widget.dispose(Unknown Source)	at org.eclipse.swt.widgets.Shell.dispose(Unknown Source)	at org.eclipse.jface.window.Window.close(Window.java:330)	at org.eclipse.jface.dialogs.Dialog.close(Dialog.java:971)	at org.eclipse.jface.dialogs.TrayDialog.close(TrayDialog.java:143)	at org.pentaho.ui.xul.swt.tags.SwtDialog.hide(SwtDialog.java:513)	at org.pentaho.ui.xul.swt.tags.SwtDialog.setVisible(SwtDialog.java:525)	at org.pentaho.di.ui.core.database.dialog.XulDatabaseExplorerController.cancel(XulDatabaseExplorerController.java:265)	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.pentaho.ui.xul.impl.AbstractXulDomContainer.invoke(AbstractXulDomContainer.java:329)	at org.pentaho.ui.xul.impl.AbstractXulComponent.invoke(AbstractXulComponent.java:135)	at org.pentaho.ui.xul.impl.AbstractXulComponent.invoke(AbstractXulComponent.java:123)	at org.pentaho.ui.xul.swt.tags.SwtDialog.access$200(SwtDialog.java:48)	at org.pentaho.ui.xul.swt.tags.SwtDialog$2.shellClosed(SwtDialog.java:292)	at org.eclipse.swt.widgets.TypedListener.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.Shell.closeWidget(Unknown Source)	at org.eclipse.swt.widgets.Shell.gtk_delete_event(Unknown Source)	at org.eclipse.swt.widgets.Widget.windowProc(Unknown Source)	at org.eclipse.swt.widgets.Control.windowProc(Unknown Source)	at org.eclipse.swt.widgets.Display.windowProc(Unknown Source)	at org.eclipse.swt.internal.gtk.OS._gtk_main_do_event(Native Method)	at org.eclipse.swt.internal.gtk.OS.gtk_main_do_event(Unknown Source)	at org.eclipse.swt.widgets.Display.eventProc(Unknown Source)	at org.eclipse.swt.internal.gtk.OS._g_main_context_iteration(Native Method)	at org.eclipse.swt.internal.gtk.OS.g_main_context_iteration(Unknown Source)	at org.eclipse.swt.widgets.Display.readAndDispatch(Unknown Source)	at org.eclipse.jface.window.Window.runEventLoop(Window.java:820)	at org.eclipse.jface.window.Window.open(Window.java:796)	at org.pentaho.ui.xul.swt.tags.SwtDialog.show(SwtDialog.java:378)	at org.pentaho.ui.xul.swt.tags.SwtDialog.show(SwtDialog.java:304)	at org.pentaho.di.ui.core.database.dialog.XulDatabaseExplorerDialog.open(XulDatabaseExplorerDialog.java:93)	at org.pentaho.di.ui.spoon.delegates.SpoonDBDelegate.exploreDB(SpoonDBDelegate.java:183)	at org.pentaho.di.ui.spoon.Spoon.exploreDB(Spoon.java:2468)	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.pentaho.ui.xul.impl.AbstractXulDomContainer.invoke(AbstractXulDomContainer.java:329)	at org.pentaho.ui.xul.impl.AbstractXulComponent.invoke(AbstractXulComponent.java:135)	at org.pentaho.ui.xul.impl.AbstractXulComponent.invoke(AbstractXulComponent.java:123)	at org.pentaho.ui.xul.swt.tags.SwtMenuitem.access$100(SwtMenuitem.java:27)	at org.pentaho.ui.xul.swt.tags.SwtMenuitem$1.widgetSelected(SwtMenuitem.java:77)	at org.eclipse.swt.widgets.TypedListener.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.Display.runDeferredEvents(Unknown Source)	at org.eclipse.swt.widgets.Display.readAndDispatch(Unknown Source)	at org.pentaho.di.ui.spoon.Spoon.readAndDispatch(Spoon.java:1153)	at org.pentaho.di.ui.spoon.Spoon.start(Spoon.java:6725)	at org.pentaho.di.ui.spoon.Spoon.main(Spoon.java:537)