java.lang.NullPointerException
    at com.sun.org.apache.xerces.internal.dom.ParentNode.nodeListGetLength(ParentNode.java:745)
    at com.sun.org.apache.xerces.internal.dom.ParentNode.getLength(ParentNode.java:757)
    at org.netbeans.modules.ant.freeform.spi.support.Util.findElement(Util.java:60)
    at org.netbeans.modules.ant.freeform.FreeformSources.initSources(FreeformSources.java:64)
    at org.netbeans.modules.ant.freeform.FreeformSources.access$100(FreeformSources.java:37)
    at org.netbeans.modules.ant.freeform.FreeformSources$1.run(FreeformSources.java:54)
    at org.openide.util.Mutex.readAccess(Mutex.java:181)
    at org.netbeans.modules.ant.freeform.FreeformSources.getSourceGroups(FreeformSources.java:51)
    at org.netbeans.modules.project.ui.PhysicalView.createNodesForProject(PhysicalView.java:72)
    at org.netbeans.modules.project.ui.ProjectsRootNode$ProjectChildren.createNodes(ProjectsRootNode.java:218)
    at org.openide.nodes.Children$Keys$KE.nodes(Children.java:2050)
    at org.openide.nodes.ChildrenArray.nodesFor(ChildrenArray.java:112)
    at org.openide.nodes.Children$Info.nodes(Children.java:1137)
    at org.openide.nodes.Children.justComputeNodes(Children.java:638)
    at org.openide.nodes.ChildrenArray.nodes(ChildrenArray.java:54)
    at org.openide.nodes.Children.getNodes(Children.java:331)
    at org.openide.nodes.Children.findChild(Children.java:264)
    at org.openide.nodes.Children.getNodes(Children.java:387)
    at org.openide.explorer.view.TreeView$1.run(TreeView.java:756)
    at org.openide.util.Task.run(Task.java:189)
    at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:330)
[catch] at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:721)