I use Netonsoft.Json in my project. It works fine until I start integrating Paypal SDK in my Project. My code is as below.
String AccessToken =
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I faced the same problem, I have installed Newtonsoft.Json v9.0.1 , sandcastle stops the build displaying the same error but with version difference: "Could not load file or assembly 'Newtonsoft.Json, Version=6.0.0.0,"
what worked: find/create a project with newtonsoft.json with the version SandCastle is asking for, add the file "Newtonsoft.Json.dll" as a reference to the SC project then build. (you can find the dll in the bin folder of the project)