java.lang.NullPointerException
        at org.netbeans.modules.debugger.jpda.projects.MainProjectManager.getProjectRoots(MainProjectManager.java:163)
        at org.netbeans.modules.debugger.jpda.projects.MainProjectManager.isDependent(MainProjectManager.java:142)
        at org.netbeans.modules.debugger.jpda.projects.MainProjectManager.getMainProject(MainProjectManager.java:105)
        at org.netbeans.modules.debugger.jpda.projects.StepIntoActionProvider.shouldBeEnabled(StepIntoActionProvider.java:130)
        at org.netbeans.modules.debugger.jpda.projects.StepIntoActionProvider.access$200(StepIntoActionProvider.java:70)
        at org.netbeans.modules.debugger.jpda.projects.StepIntoActionProvider$Listener.doSetEnabled(StepIntoActionProvider.java:181)
        at org.netbeans.modules.debugger.jpda.projects.StepIntoActionProvider$Listener.propertyChange(StepIntoActionProvider.java:158)
        at org.openide.util.WeakListenerImpl$PropertyChange.propertyChange(WeakListenerImpl.java:186)
        at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:339)
        at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:276)
        at org.netbeans.modules.debugger.jpda.projects.MainProjectManager.propertyChange(MainProjectManager.java:194)
        at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:339)
        at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:276)
        at org.netbeans.modules.project.ui.OpenProjectsTrampolineImpl.propertyChange(OpenProjectsTrampolineImpl.java:110)
        at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:339)
        at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:276)
        at org.netbeans.modules.project.ui.OpenProjectList.setMainProject(OpenProjectList.java:808)
        at org.netbeans.modules.project.ui.OpenProjectsTrampolineImpl.setMainProject(OpenProjectsTrampolineImpl.java:119)
        at org.netbeans.api.project.ui.OpenProjects.setMainProject(OpenProjects.java:218)
        at org.netbeans.modules.versioning.system.cvss.ui.actions.checkout.CheckoutAction$CheckoutCompletedController.openProject(CheckoutAction.java:351)
        at org.netbeans.modules.versioning.system.cvss.ui.actions.checkout.CheckoutAction$CheckoutCompletedController.actionPerformed(CheckoutAction.java:335)
        at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
        at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
        at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
        at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
        at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)
        at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:272)
        at java.awt.Component.processMouseEvent(Component.java:6041)
        at javax.swing.JComponent.processMouseEvent(JComponent.java:3265)
        at java.awt.Component.processEvent(Component.java:5806)
        at java.awt.Container.processEvent(Container.java:2058)
        at java.awt.Component.dispatchEventImpl(Component.java:4413)
        at java.awt.Container.dispatchEventImpl(Container.java:2116)
        at java.awt.Component.dispatchEvent(Component.java:4243)
        at java.awt.LightweightDispatcher.retargetMouseEvent(LightweightDispatcher.java:4322)
        at java.awt.LightweightDispatcher.processMouseEvent(LightweightDispatcher.java:3986)
        at java.awt.LightweightDispatcher.dispatchEvent(LightweightDispatcher.java:3916)
        at java.awt.Container.dispatchEventImpl(Container.java:2102)
        at java.awt.Window.dispatchEventImpl(Window.java:2440)
        at java.awt.Component.dispatchEvent(Component.java:4243)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
        at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:104)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:177)
        at java.awt.Dialog$1.run(Dialog.java:1045)
        at java.awt.Dialog$3.run(Dialog.java:1097)
        at java.security.AccessController.doPrivileged(AccessController.java:0)
        at java.awt.Dialog.show(Dialog.java:1095)
        at org.netbeans.core.windows.services.NbPresenter.superShow(NbPresenter.java:867)
        at org.netbeans.core.windows.services.NbPresenter.doShow(NbPresenter.java:901)
        at org.netbeans.core.windows.services.NbPresenter.run(NbPresenter.java:889)
        at org.netbeans.core.windows.services.NbPresenter.run(NbPresenter.java:109)
        at org.openide.util.Mutex.doEventAccess(Mutex.java:1355)
        at org.openide.util.Mutex.readAccess(Mutex.java:268)
        at org.netbeans.core.windows.services.NbPresenter.show(NbPresenter.java:874)
        at java.awt.Component.show(Component.java:1422)
        at java.awt.Component.setVisible(Component.java:1375)
        at java.awt.Window.setVisible(Window.java:806)
        at java.awt.Dialog.setVisible(Dialog.java:985)
        at org.netbeans.modules.versioning.system.cvss.ui.actions.checkout.CheckoutAction$CheckoutCompletedController$1.run(CheckoutAction.java:290)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
        at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:104)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)