Most probably you are running a build for .NET 2.0 or 3.5 under application pool that uses ASP.NET Framework 4.0 or similar configuration. Please make sure that the project dlls
are compiled for the same version of .NET Framework that your application pool uses.
the Telerik team
Do you want to have your say when we set our development plans?
Do you want to know when a feature you care about is added or when a bug fixed?
Telerik Public Issue Tracking
system and vote to affect the priority of the items