First, It is not just duplicate. None of answers from following questions are working for me.
http://goo.gl/tS40cn http://goo.gl/pH6v2T
I\'ve just updated al
I had this error myself, and first used Update-Package –reinstall Newtonsoft.Json -IncludePrerelease it didn't work, then used Install-Package Newtonsoft.Json . it worked.
Update-Package –reinstall Newtonsoft.Json -IncludePrerelease
Install-Package Newtonsoft.Json