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java.lang.NullPointerException: 	at	at org.eclipse.ui.internal.dialogs.PropertyPageNode.disposeResources(	at org.eclipse.jface.preference.PreferenceDialog.close(	at org.eclipse.ui.internal.dialogs.FilteredPreferenceDialog.close(	at org.eclipse.jface.preference.PreferenceDialog.cancelPressed(	at org.eclipse.jface.preference.PreferenceDialog.handleShellCloseEvent(