Thanks for your response.
I followed the instructions: now web.config now has the following:
I now get the following error:
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RadUpload Ajax callback error. Source url was not found:
/Telerik.RadUploadProgressHandler.aspx?RadUrid=2b0f48b9-5969-47de-937b-efc7ff6b34e1
Did you register the RadUploadProgressHandler in web.config?
Please, see the help for more details: RadUpload 2.x - Using RadUpload - Configuration - RadUploadProgressHandler.
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Its worth noting that I just want to use telerik's progress bar only. i plan to using asp.net upload control.
thanks again.