My suggestion is to download the Sitefinity 4.1.1395.0 installation and install it. Also make sure that the references in your project are either pointing to the bin folder of your SitefinityWebApp, so that there is no mismatch of the versions. If you don't like the idea of making references directly to the bin folder you can point your assemblies to the C:\Program Files\Telerik\Sitefinity 4.1\SDK\Content\Common\Dependencies
folder of your SDK that contains all references and tools necessary to build your project.
I have a quick question, have you chosen to install the OpenAccess installation that is delivered with the SDK?
Please let me know whether you need further assistance, so that we can resolve your issue on time.
the Telerik team
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