It is unfortunate that you are experiencing such issue with JustMock.
To help you on the matter, we would need you to open VS2012 Native Tools Command Prompt, navigate to the Telerik JustMock Libraries root folder(e.g. ...\Program Files (x86)\Telerik\JustMock\Libraries) and execute the following line:
sn -T Telerik.CodeWeaver.Api.dll
Then, we would need to see what is the public key token of that file on your machine.
I have attached a screenshot, to guide you further.
Thank you for the collaboration in advance.
the Telerik team
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