java.lang.NullPointerException: Must pass a non-null filename
	at org.netbeans.spi.project.support.ant.AntProjectHelper.resolveFileObject(AntProjectHelper.java:942)
	at org.netbeans.modules.web.project.ui.WebViews$LogicalViewChildren.getSources(WebViews.java:264)
	at org.netbeans.modules.web.project.ui.WebViews$LogicalViewChildren.getKeys(WebViews.java:258)
	at org.netbeans.modules.web.project.ui.WebViews$LogicalViewChildren.buildKeys(WebViews.java:126)
	at org.netbeans.modules.web.project.ui.WebViews$LogicalViewChildren.addNotify(WebViews.java:116)
	at org.openide.nodes.Children.callAddNotify(Children.java:426)
	at org.openide.nodes.Children.getArray(Children.java:476)
	at org.openide.nodes.Children.getNodes(Children.java:322)
	at org.openide.nodes.FilterNode$ChildrenAdapter.run(FilterNode.java:1386)
	at org.openide.nodes.FilterNode$Children.updateKeys(FilterNode.java:1342)
	at org.openide.nodes.FilterNode$Children.addNotifyImpl(FilterNode.java:1239)
	at org.openide.nodes.FilterNode$Children.addNotify(FilterNode.java:1231)
	at org.openide.nodes.Children.callAddNotify(Children.java:426)
	at org.openide.nodes.Children.getArray(Children.java:476)
	at org.openide.nodes.Children.getNodes(Children.java:322)
	at org.openide.explorer.view.VisualizerNode.getChildren(VisualizerNode.java:192)
	at org.openide.explorer.view.VisualizerNode.getChildCount(VisualizerNode.java:231)
	at javax.swing.tree.DefaultTreeModel.getChildCount(DefaultTreeModel.java:168)
	at javax.swing.tree.VariableHeightLayoutCache$TreeStateNode.expand(VariableHeightLayoutCache.java:1461)
	at javax.swing.tree.VariableHeightLayoutCache$TreeStateNode.expand(VariableHeightLayoutCache.java:1270)
	at javax.swing.tree.VariableHeightLayoutCache.ensurePathIsExpanded(VariableHeightLayoutCache.java:966)
	at javax.swing.tree.VariableHeightLayoutCache.setExpandedState(VariableHeightLayoutCache.java:164)
	at javax.swing.plaf.basic.BasicTreeUI.updateExpandedDescendants(BasicTreeUI.java:1542)
	at javax.swing.plaf.basic.BasicTreeUI$Handler.treeExpanded(BasicTreeUI.java:3578)
	at javax.swing.JTree.fireTreeExpanded(JTree.java:2235)
	at javax.swing.JTree.setExpandedState(JTree.java:3006)
	at javax.swing.JTree.expandPath(JTree.java:1742)
	at javax.swing.plaf.basic.BasicTreeUI.toggleExpandState(BasicTreeUI.java:2149)
	at javax.swing.plaf.basic.BasicTreeUI.handleExpandControlClick(BasicTreeUI.java:2136)
	at javax.swing.plaf.basic.BasicTreeUI.checkForClickInExpandControl(BasicTreeUI.java:2090)
	at javax.swing.plaf.basic.BasicTreeUI$Handler.handleSelection(BasicTreeUI.java:3423)
	at javax.swing.plaf.basic.BasicTreeUI$Handler.mousePressed(BasicTreeUI.java:3393)
	at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:222)
	at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:221)
	at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:221)
	at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:221)
	at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:221)
	at java.awt.Component.processMouseEvent(Component.java:5485)
	at javax.swing.JComponent.processMouseEvent(JComponent.java:3093)
	at java.awt.Component.processEvent(Component.java:5253)
	at java.awt.Container.processEvent(Container.java:1966)
	at java.awt.Component.dispatchEventImpl(Component.java:3955)
	at java.awt.Container.dispatchEventImpl(Container.java:2024)
	at java.awt.Component.dispatchEvent(Component.java:3803)
	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4212)
	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3889)
	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3822)
	at java.awt.Container.dispatchEventImpl(Container.java:2010)
	at java.awt.Window.dispatchEventImpl(Window.java:1766)
	at java.awt.Component.dispatchEvent(Component.java:3803)
[catch] at java.awt.EventQueue.dispatchEvent(EventQueue.java:463)
	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:234)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)