java.lang.NullPointerException
   at org.netbeans.modules.project.ui.OpenProjectList.doOpenProject(OpenProjectList.java:1160)
   at org.netbeans.modules.project.ui.OpenProjectList.doOpen(OpenProjectList.java:700)
   at org.netbeans.modules.project.ui.OpenProjectList.open(OpenProjectList.java:613)
   at org.netbeans.modules.project.ui.OpenProjectList.open(OpenProjectList.java:549)
   at org.netbeans.modules.project.ui.OpenProjectsTrampolineImpl.openAPI(OpenProjectsTrampolineImpl.java:75)
   at org.netbeans.api.project.ui.OpenProjects.open(OpenProjects.java:172)
   at org.netbeans.modules.project.uiapi.DefaultProjectOperationsImplementation.open(DefaultProjectOperationsImplementation.java:750)
   at org.netbeans.modules.project.uiapi.DefaultProjectOperationsImplementation.doRenameProjectOld(DefaultProjectOperationsImplementation.java:454)
   at org.netbeans.modules.project.uiapi.DefaultProjectOperationsImplementation.doRenameProject(DefaultProjectOperationsImplementation.java:386)
   at org.netbeans.modules.project.uiapi.DefaultProjectOperationsImplementation.access$500(DefaultProjectOperationsImplementation.java:102)
Caused: java.io.IOException: java.lang.NullPointerException
   at org.netbeans.modules.project.uiapi.DefaultProjectOperationsImplementation$4$1.run(DefaultProjectOperationsImplementation.java:371)
   at org.openide.filesystems.EventControl.runAtomicAction(EventControl.java:125)
   at org.openide.filesystems.FileSystem.runAtomicAction(FileSystem.java:542)
   at org.netbeans.modules.project.uiapi.DefaultProjectOperationsImplementation$4.execute(DefaultProjectOperationsImplementation.java:364)
   at org.netbeans.modules.project.uiapi.DefaultProjectOperationsImplementation$6$1.run(DefaultProjectOperationsImplementation.java:641)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1418)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1957)