java.lang.NullPointerException
   at org.openide.filesystems.FileUtil.toFile(FileUtil.java:829)
   at org.netbeans.modules.maven.model.Utilities.createModelSource(Utilities.java:187)
   at org.netbeans.modules.maven.model.Utilities.createModelSource(Utilities.java:181)
   at org.netbeans.modules.maven.model.Utilities.performPOMModelOperations(Utilities.java:287)
   at org.netbeans.modules.maven.operations.RenameProjectPanel$5.run(RenameProjectPanel.java:278)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1423)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2033)