No overload for method 'Deserialize' takes 2 arguments.

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C#

Hello, I did a code for login which return json value and I convert it through DynamicJsonConverter but it showing error :"No overload for method 'Deserialize' takes 2 arguments" and my code is here :

//login code
      private void button1_Click(object sender, EventArgs e)
      {
          string query = ("aUserName=" + "abc" + "&aPassword=" + "xyz").ToString();
          WebClient wc = new WebClient();
          wc.DownloadStringAsync(new Uri("http://dev.livestuff.com/.LoginAsJSON?" + query));
          wc.DownloadStringCompleted += wc_DownloadStringCompleted;
      }
      /
      /****** Code to serialize the login data *****/
      void wc_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
      {

          var serializer = new JavaScriptSerializer();
          serializer.RegisterConverters(new[] { new DynamicJsonConverter() });

         //showing error in this line
          dynamic obj = serializer.Deserialize(e.Result, typeof(object));

          dynamic dd = obj["HierarchyPosition"];

          if (dd == null)
          {
               MessageBox.Show("Email ID and/or Password is incorrect.");
          }
          else
          {

          }

      }

Anyone can suggests me to solve this problem.
Thanks.