java.lang.NullPointerException: The dir parameter cannot be null
        at org.openide.util.Parameters.notNull(Parameters.java:86)
        at org.apache.tools.ant.module.api.support.ActionUtils.antIncludesList(ActionUtils.java:250)
        at org.apache.tools.ant.module.api.support.ActionUtils.antIncludesList(ActionUtils.java:232)
        at org.netbeans.modules.java.j2seproject.J2SEActionProvider.setupTestSingle(J2SEActionProvider.java:821)
        at org.netbeans.modules.java.j2seproject.J2SEActionProvider.getTargetNames(J2SEActionProvider.java:677)
        at org.netbeans.modules.java.j2seproject.J2SEActionProvider$4.run(J2SEActionProvider.java:378)
        at org.netbeans.api.java.source.ui.ScanDialog.runWhenScanFinished(ScanDialog.java:150)
        at org.netbeans.modules.java.j2seproject.J2SEActionProvider.invokeAction(J2SEActionProvider.java:482)
        at org.netbeans.modules.project.ui.actions.FileCommandAction.actionPerformed(FileCommandAction.java:96)
        at org.netbeans.modules.project.ui.actions.LookupSensitiveAction.actionPerformed(LookupSensitiveAction.java:166)
        at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2015)
        at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2338)
        at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
        at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
        at javax.swing.AbstractButton.doClick(AbstractButton.java:376)
        at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:824)
        at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:868)
        at java.awt.Component.processMouseEvent(Component.java:6260)
        at javax.swing.JComponent.processMouseEvent(JComponent.java:3309)
        at java.awt.Component.processEvent(Component.java:6025)
        at java.awt.Container.processEvent(Container.java:2083)
        at java.awt.Component.dispatchEventImpl(Component.java:4620)
        at java.awt.Container.dispatchEventImpl(Container.java:2141)
        at java.awt.Component.dispatchEvent(Component.java:4446)
        at java.awt.LightweightDispatcher.retargetMouseEvent(LightweightDispatcher.java:4665)
        at java.awt.LightweightDispatcher.processMouseEvent(LightweightDispatcher.java:4328)
        at java.awt.LightweightDispatcher.dispatchEvent(LightweightDispatcher.java:4258)
        at java.awt.Container.dispatchEventImpl(Container.java:2127)
        at java.awt.Window.dispatchEventImpl(Window.java:2609)
        at java.awt.Component.dispatchEvent(Component.java:4446)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:605)
        at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:104)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:286)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:201)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:191)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:186)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:178)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:139)