Can you please check this folder: ~/Sitefinity/ServiceAssemblies/? It must contain a dynamically generated assembly, if it does not, then it means that the application pool cannot write the assembly to this folder. This might be the case if the application is running in Medium Trust or if there are some additional restrictions there. If this is the case you can get a local copy of the site, run it where it will generate the assembly and then put the assembly in this folder.
the Telerik team
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