java.lang.IllegalStateException: #210991: got neither a result nor an exception; started=false finished=false invoked=true
   at org.openide.util.Mutex.doEventAccess(Mutex.java:1406)
   at org.openide.util.Mutex.readAccess(Mutex.java:273)
   at org.netbeans.modules.project.ui.OpenProjectList.open(OpenProjectList.java:748)
   at org.netbeans.modules.project.ui.OpenProjectList$4.run(OpenProjectList.java:584)
Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to: java.lang.IllegalStateException: #210991: got neither a result nor an exception; started=false finished=false invoked=true
   at org.openide.util.RequestProcessor.post(RequestProcessor.java:424)
   at org.netbeans.modules.project.ui.OpenProjectList.open(OpenProjectList.java:580)
   at org.netbeans.modules.project.ui.actions.NewProject.doPerform(NewProject.java:206)
   at org.netbeans.modules.project.ui.actions.NewProject.access$000(NewProject.java:91)
   at org.netbeans.modules.project.ui.actions.NewProject$1.run(NewProject.java:100)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1452)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2032)