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
check the 'Newtonsoft.Json' version in the project references. Add that version in the Web config. It will work. For Example: your Webconfig look like this:
If your version in References is '9.0.0.0' change to this: