Telerik.Charting does not exist as a stand-alone assembly since RadControls for ASP.NET AJAX 2008 Q3. You can find more details here
. As for the error -- indeed, we introduced such issue with 2009 Q1, however our developers fixed it and the fix is available in the latest service pack release. Please, download and use RadControls for ASP.NET AJAX 2009 Q1 SP1.
All the best,
the Telerik team
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