Microsoft JScript runtime error: Circular reference in value argument not supported

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ASP.NET

MVC4

Knockout.js

hi all,

In my web application i am getting error like Microsoft JScript runtime error: Circular reference in value argument not supported.here is my code:

self.Update = function (Entity) {

       $.ajax({
           url: '/api/dtapi/Job',
           cache: false,
           type: 'PUT',
           contentType: 'application/json; charset=utf-8',
           data: ko.toJSON(Entity),
           success: function (data) {

               if (data != null) {
         alert('updated');

               }
               else {
       alert('not updated');

               }
           }

       })
   }

please help me to findout solution.