Hello,
This is a web app configuration problem, which is not directly related to Telerik controls and which is most likely caused by an application restart. You can find information about
the error in Google along with suggestions how to solve it.
Our suggestion is to enable the CDN support of RadControls for ASP.NET AJAX and see whether this will solve the issue:
CDN Overview, e.g.
All the best,
Rumen
the Telerik team
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