In my code I use the following technique to download files
Public void onSuccess(Object result) {             
                String reportName = (String)result;                
                String url = GWT.getModuleBaseURL() + "ReportUploadHandler" 
+ "?rname=" + reportName;
                Frame frame = new Frame(url);
                frame.setVisible(false);                
                RootPanel.get().add(frame);                
}

It seems to work just fine however occasionally I see the following message 
(sometimes repeated several times)
Cannot read property 'offsetWidth' of null in the console of the Chrome 
browser. I have never seen it in Fire Fox.

Any ideas?

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