Here is the properties of the DLL in our Library folder which we reference:

Originally, the Telerik installation only installed the 3.5 components. I unchecked all of the 3.5 components and created a new tab in the Toolbox. Then I Browsed to the Telerik DLL above and the result was that these components were added.

When I drag a control onto an ASPX page, this is the error I receive:

Here is the Web References:

Here is the Build settings:

1 comment:
Your problem appears to stem from the httphandlers in your web.config file that use a fully qualified name. Namely the Telerik DialogHandler and SpellCheckHandler declarations. Below is a link to a Telerik KB article.
KB Article
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