'Project currently contains references to more than one version

I am getting the following error. I tried to add references but I was unable to find a System.Web.Http in it. Please advice how to resolve this issue?

The project currently contains references to more than one version of System.Web.Http, a direct reference to version 5.2.7.0 and an indirect reference (through 'TestPro.App.ServicesAssemblyResolver') to version 5.2.8.0. Change the direct reference to use version 5.2.8.0 (or higher) of System.Web.Http.



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