09 Sep 2007
22 Apr 2011
Link to this post
This probably just means the project's assembly references are out of date.
You'll likely need to remove the 'Telerik.Sitefinity' reference and then re-add a reference to the Telerik.Sitefinity.dll that sits in the project's ~/bin folder. It's also very likely that you'll get this error for other references after fixing this reference. I normally just remove all references to any 'Telerik.*' assemblies and then re-add references to the files in the Sitefinity ~/bin folder.
If this message made no sense, let me know and I'll try to explain it better.
Telerik | Sitefinity CMS