It looks like you're trying to display a 'null' NodeInfo: http://code.google.com/p/google-web-toolkit/source/browse/tags/2.1.0/user/src/com/google/gwt/user/cellview/client/CellBrowser.java?r=9507#939 In other words, your TreeViewModel returns 'null' from getNodeInfo for the rootValue you're using (i.e. Model1.getNodeInfo(SelectedCategory.getAllAttributes()) returns 'null')
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