java.lang.NullPointerException
   at org.netbeans.api.java.source.SourceUtils.getDependentRootsImpl(SourceUtils.java:728)
   at org.netbeans.api.java.source.SourceUtils.getDependentRoots(SourceUtils.java:717)
   at org.netbeans.modules.debugger.jpda.projects.MainProjectManager.isDependent(MainProjectManager.java:163)
   at org.netbeans.modules.debugger.jpda.projects.MainProjectManager.getMainProject(MainProjectManager.java:112)
   at org.netbeans.modules.debugger.jpda.projects.RunToCursorActionProvider.shouldBeEnabled(RunToCursorActionProvider.java:192)
   at org.netbeans.modules.debugger.jpda.projects.RunToCursorActionProvider.access$100(RunToCursorActionProvider.java:77)
   at org.netbeans.modules.debugger.jpda.projects.RunToCursorActionProvider$Listener.propertyChange(RunToCursorActionProvider.java:233)
   at org.netbeans.api.debugger.DebuggerManager.fireEngineAdded(DebuggerManager.java:1329)
   at org.netbeans.api.debugger.DebuggerManager.addEngine(DebuggerManager.java:1533)
   at org.netbeans.api.debugger.Session.addLanguage(Session.java:376)
   at org.netbeans.api.debugger.DebuggerManager.startDebugging(DebuggerManager.java:377)
   at org.netbeans.api.debugger.jpda.JPDADebugger.startListening(JPDADebugger.java:220)
   at org.netbeans.modules.debugger.jpda.ant.JPDAStart$1.run(JPDAStart.java:444)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:602)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1084)