As noted in the Silverlight Report Viewer
system requirements, you should use the corresponding RadControls for Silverlight version
, available at the time of the Telerik Reporting
release. As you have given the versions, you're currently trying to use Q3 2011 of RadControls with Q2 2012 of Telerik Reporting i.e. those versions do not match. If you have not installed RadControls on you machine, you can get the corresponding version from our examples folder (C:\Program Files\Telerik\Reporting Q2 2012\Examples\CSharp\SilverlightDemo\bin).
the Telerik team
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