java.lang.NullPointerException
	at org.netbeans.modules.javacore.parser.ASTProvider.<init>(ASTProvider.java:64)
	at org.netbeans.modules.javacore.parser.ASTProvider.<init>(ASTProvider.java:68)
	at org.netbeans.modules.javacore.parser.MDRParser.<init>(MDRParser.java:72)
	at org.netbeans.modules.javacore.parser.ResourceInfo.refreshASTree(ResourceInfo.java:47)
	at org.netbeans.modules.javacore.jmiimpl.javamodel.MetadataElement.getASTree(MetadataElement.java:898)
	at org.netbeans.modules.javacore.jmiimpl.javamodel.MetadataElement.getASTree(MetadataElement.java:428)
	at org.netbeans.modules.javacore.jmiimpl.javamodel.SemiPersistentElement.getParser(SemiPersistentElement.java:345)
	at org.netbeans.modules.javacore.jmiimpl.javamodel.ElementNavigator.<init>(ElementNavigator.java:32)
	at org.netbeans.modules.javacore.jmiimpl.javamodel.UsageFinder.getUsers(UsageFinder.java:62)
	at org.netbeans.modules.javacore.jmiimpl.javamodel.SemiPersistentElement.getReferences(SemiPersistentElement.java:129)
	at org.netbeans.jmi.javamodel.Method$Impl.getReferences(Unknown Source)
	at org.netbeans.api.refactoring.WhereUsedQuery.prepare(WhereUsedQuery.java:57)
	at org.netbeans.api.refactoring.ui.ParametersPanel$7.run(ParametersPanel.java:408)
	at org.openide.util.Task.run(Task.java:136)
	at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:330)
[catch] at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:686)