java.lang.NullPointerException
   at org.openide.util.lookup.InstanceContent$SimpleItem.<init>(InstanceContent.java:195)
   at org.openide.util.lookup.SimpleLookup.<init>(SimpleLookup.java:69)
   at org.openide.util.lookup.Lookups.fixed(Lookups.java:108)
   at org.netbeans.modules.javafx.refactoring.impl.plugins.SafeDeleteRefactoringPlugin.createQuery(SafeDeleteRefactoringPlugin.java:269)
   at org.netbeans.modules.javafx.refactoring.impl.plugins.SafeDeleteRefactoringPlugin.checkParameters(SafeDeleteRefactoringPlugin.java:131)
   at org.netbeans.modules.refactoring.api.AbstractRefactoring.pluginsCheckParams(AbstractRefactoring.java:483)
   at org.netbeans.modules.refactoring.api.AbstractRefactoring.checkParameters(AbstractRefactoring.java:243)
   at org.netbeans.modules.javafx.refactoring.impl.ui.SafeDeleteUI.setParameters(SafeDeleteUI.java:173)
   at org.netbeans.modules.refactoring.spi.impl.ParametersPanel$Prepare.run(ParametersPanel.java:787)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1356)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1894)