java.lang.IllegalArgumentException
        at org.netbeans.spi.project.support.GenericSources$Group.contains(GenericSources.java:132)
        at org.netbeans.modules.j2ee.earproject.ui.ArchiveViews$LogicalViewChildren.createNodes(ArchiveViews.java:125)
        at org.openide.nodes.Children$Keys$KE.nodes(Children.java:2131)
        at org.openide.nodes.ChildrenArray.nodesFor(ChildrenArray.java:120)
        at org.openide.nodes.Children$Info.nodes(Children.java:1199)
[catch] at org.openide.nodes.Children.justComputeNodes(Children.java:665)
        at org.openide.nodes.ChildrenArray.nodes(ChildrenArray.java:56)
        at org.openide.nodes.Children.getNodes(Children.java:350)
        at org.openide.nodes.Children.findChild(Children.java:283)
        at org.openide.nodes.Children.getNodes(Children.java:407)
        at org.openide.nodes.FilterNode$Children.getNodes(FilterNode.java:1407)
        at org.openide.explorer.view.TreeView$2.run(TreeView.java:797)
        at org.openide.util.Task.run(Task.java:207)
        at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:469)
        at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:870)