java.lang.NullPointerException
   at org.netbeans.modules.maven.indexer.api.RepositoryQueries.getLoadedContexts(RepositoryQueries.java:580)
   at org.netbeans.modules.maven.refactoring.MavenRefactoringPlugin.prepare(MavenRefactoringPlugin.java:113)
   at org.netbeans.modules.refactoring.api.AbstractRefactoring.pluginsPrepare2(AbstractRefactoring.java:442)
   at org.netbeans.modules.refactoring.api.AbstractRefactoring.pluginsPrepare(AbstractRefactoring.java:426)
   at org.netbeans.modules.refactoring.api.AbstractRefactoring.prepare(AbstractRefactoring.java:237)
   at org.netbeans.modules.refactoring.spi.impl.ParametersPanel$Prepare$2.run(ParametersPanel.java:1086)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1443)
   at org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:68)
   at org.openide.util.lookup.Lookups.executeWith(Lookups.java:303)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2058)