Telerik namespace error on MVC3 project

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ASP.NET

Telerik

MVC3

I have an MVC3 project that uses some Telerik MVC extensions. It works fine on the VS 2010 built-in web server, for debugging, but when I deploy it to IIS on my host, I get the following compilation error:

CS0246: The type or namespace name 'Telerik' could not be found (are you missing a using directive or an assembly reference?)

The error occurs on line 86 in the code below, from the site root web.config. I have the namespace in both the Views/web.config and the root config.

Line 84:                 <add namespace="System.Web.Routing" />
Line 85:                 <add namespace="System.Web.WebPages" />
Line 86:                 <add namespace="Telerik.Web.Mvc.UI" />
Line 87:             </namespaces>
Line 88:         </pages>

Any ideas what could be wrong? The assembly is definitely available in the bin folder on the host server