The assembly from the WPF folder are not needed in an MVC project. Removing the WPF references and adding only the necessary ones from the "C:\Program Files (x86)\Telerik\UI for ASP.NET MVC R3 2016\spreadsheet\binaries\net40\
" folder should solve your problem.
Basically, the UI for WPF
and UI for ASP.NET MVC
are two completely different and unrelated suites. If you are developing an ASP.NET MVC project, then only the UI for ASP.NET MVC suite is necessary.
Also, all referenced assemblies should be from the same release (for example R3) and should have the same .NET version (for example 4.0).
I would also recommend you to review the local demos that you should have installed in the "C:\Program Files (x86)\Telerik\UI for ASP.NET MVC R3 2016\wrappers\aspnetmvc\Examples
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