java.lang.IllegalStateException: Listener 809588084 is not attached to J2SEProjectPlatform 290540396 for Project GitApp.
   at org.netbeans.modules.javawebstart.JWSProjectOpenHook$PlatformListener.detach(JWSProjectOpenHook.java:219)
   at org.netbeans.modules.javawebstart.JWSProjectOpenHook.projectClosed(JWSProjectOpenHook.java:164)
   at org.netbeans.spi.project.ui.ProjectOpenedHook$1.projectClosed(ProjectOpenedHook.java:89)
   at org.netbeans.spi.project.ui.support.UILookupMergerSupport$OpenHookImpl.projectClosed(UILookupMergerSupport.java:260)
   at org.netbeans.spi.project.ui.ProjectOpenedHook$1.projectClosed(ProjectOpenedHook.java:89)
   at org.netbeans.modules.project.ui.OpenProjectList.notifyClosed(OpenProjectList.java:1254)
   at org.netbeans.modules.project.ui.OpenProjectList.access$2500(OpenProjectList.java:137)
   at org.netbeans.modules.project.ui.OpenProjectList$10.run(OpenProjectList.java:923)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1432)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2042)