java.lang.NullPointerException
        at org.netbeans.modules.swingapp.AppFrameworkSupport$2.run(AppFrameworkSupport.java:390)
        at org.netbeans.modules.swingapp.AppFrameworkSupport$2.run(AppFrameworkSupport.java:376)
        at org.netbeans.api.java.source.JavaSource.runUserActionTask(JavaSource.java:666)
        at org.netbeans.modules.swingapp.AppFrameworkSupport.getAppClassNameFromFile(AppFrameworkSupport.java:373)
        at org.netbeans.modules.swingapp.AppFrameworkSupport.scanFolderForApplication(AppFrameworkSupport.java:351)
        at org.netbeans.modules.swingapp.AppFrameworkSupport.scanFolderForApplication(AppFrameworkSupport.java:359)
        at org.netbeans.modules.swingapp.AppFrameworkSupport.scanFolderForApplication(AppFrameworkSupport.java:359)
        at org.netbeans.modules.swingapp.AppFrameworkSupport.scanFolderForApplication(AppFrameworkSupport.java:359)
        at org.netbeans.modules.swingapp.AppFrameworkSupport.scanFolderForApplication(AppFrameworkSupport.java:359)
        at org.netbeans.modules.swingapp.AppFrameworkSupport.scanFolderForApplication(AppFrameworkSupport.java:359)
        at org.netbeans.modules.swingapp.AppFrameworkSupport.findApplicationClass(AppFrameworkSupport.java:336)
        at org.netbeans.modules.swingapp.AppFrameworkSupport.getApplicationClassName(AppFrameworkSupport.java:210)
        at org.netbeans.modules.swingapp.AppFrameworkSupport.getApplicationClassName(AppFrameworkSupport.java:169)
        at org.netbeans.modules.swingapp.AppFrameworkSupport.isFrameworkEnabledProject(AppFrameworkSupport.java:101)
        at org.netbeans.modules.swingapp.ActionManager.getActionManager(ActionManager.java:140)
        at org.netbeans.modules.swingapp.ActionRescanJavaSourceTaskFactoryImpl$RescanTask.run(ActionRescanJavaSourceTaskFactoryImpl.java:83)
        at org.netbeans.modules.swingapp.ActionRescanJavaSourceTaskFactoryImpl$RescanTask.run(ActionRescanJavaSourceTaskFactoryImpl.java:72)
        at org.netbeans.api.java.source.JavaSource$CompilationJob.run(JavaSource.java:1671)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
        at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
        at java.util.concurrent.FutureTask.run(FutureTask.java:138)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at java.lang.Thread.run(Thread.java:619)