Newton.Json version problems

I've got a call to a webAPI service using Newton.Json:

response = await client.PostAsJsonAsync(method, data);

but when I make the call I get an IO error looking for version 6 of Newton.Json (I'm on version 5.0.4). The only other package reference I've got in my project are Microsoft.AspNet.WebApi.Client version 5.0.0 - which has a dependency for Newson.Json of at least version 4.5.

Any ideas why this could be happening? I'm using Visual Studio 2013 with IIS.
purplesoupAsked:
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käµfm³d 👽Commented:
Right-click your solution file, and then go to "Manage NuGet Packages." Look for the Newtonsoft packages; select each and click the "Manage" button. You should get a tree view showing what versions of which libraries are applied to each project in the solution. You can consolidate and/or remove the libraries that aren't being used.
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