Hello Randy Bauer,
The namespaces element defines a collection of import directives to use during assembly pre-compilation. This attribute corresponds to the @ Import
directive on an ASP.NET page. So you are referencing a non existing or not accessible namespace and as a result the error you see is thrown. Again make sure that you have reference to this namespace. You can cright click on your project in VS and select Property Pages.
the Telerik team