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Failed to execute runnable (java.lang.NullPointerException)
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.Table.getItem(Unknown Source)	at org.pentaho.di.ui.core.dialog.PreviewRowsDialog$5.run(PreviewRowsDialog.java:239)	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.swt.widgets.Display.release(Unknown Source)	at org.eclipse.swt.graphics.Device.dispose(Unknown Source)	at org.pentaho.di.ui.spoon.Spoon.dispose(Spoon.java:855)	at org.pentaho.di.ui.spoon.Spoon.start(Spoon.java:5315)	at org.pentaho.di.ui.spoon.Spoon.run(Spoon.java:5385)	at org.pentaho.di.ui.spoon.Spoon.main(Spoon.java:351)