You need to make sure that all assemblies have the same version. You can check this in Visual Studio (see attached image). Please note that the version that ends with 20 should be used when you target framework is .Net 2.0 to 3.5. The version that ends with 40 should be used for .Net 4.0 or newer.
I hope this will be useful. Let me know if you have additional questions.
Thanks. At some point I had changed references over to the older version of the controls. So changed the reference back to the latest and the problem was resolved.
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Dimitar
Telerik team
answered on 22 Aug 2017, 06:01 AM
Hello Tim,
I am glad that this is working fine now. Do not hesitate to contact us if you have other questions.