java.lang.NullPointerException
        at org.netbeans.modules.ant.debugger.breakpoints.PersistenceManager.initBreakpoints(PersistenceManager.java:74)
        at org.netbeans.api.debugger.DebuggerManager.initBreakpoints(DebuggerManager.java:877)
        at org.netbeans.api.debugger.DebuggerManager.initBreakpoints(DebuggerManager.java:819)
        at org.netbeans.api.debugger.DebuggerManager.getBreakpoints(DebuggerManager.java:565)
        at org.netbeans.modules.debugger.jpda.breakpoints.BreakpointsEngineListener.removeBreakpointImpls(BreakpointsEngineListener.java:224)
        at org.netbeans.modules.debugger.jpda.breakpoints.BreakpointsEngineListener.propertyChange(BreakpointsEngineListener.java:131)
        at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:339)
        at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:347)
        at org.netbeans.modules.debugger.jpda.JPDADebuggerImpl.firePropertyChange(JPDADebuggerImpl.java:1340)
        at org.netbeans.modules.debugger.jpda.JPDADebuggerImpl.setState(JPDADebuggerImpl.java:1324)
        at org.netbeans.modules.debugger.jpda.JPDADebuggerImpl.finish(JPDADebuggerImpl.java:1064)
        at org.netbeans.modules.debugger.jpda.actions.KillActionProvider.doAction(KillActionProvider.java:74)
        at org.netbeans.api.debugger.ActionsManager.doAction(ActionsManager.java:158)
        at org.netbeans.api.debugger.Session.kill(Session.java:278)
        at org.netbeans.modules.debugger.jpda.actions.StartActionProvider$2.run(StartActionProvider.java:244)
        at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:561)
        at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:986)