Cannot cast from source type to destination type Json

I'm retrieving a json file from my server and then using Json to deserialize the content. How ever I keep receiving this error " Cannot cast from source type to destination type", I was following the steps of the Minijson script but yet this error still comes up. Some help would be appreciated.

 using System.Collections.Generic;
 using MiniJSON;
 using UnityEngine;
 using System.Collections;
 
 public class MoreGames : MonoBehaviour {
 
     public WWW image1Request;
     public WWW url1Request;
     public string mgImage1;
     Dictionary<string, object>[] dictArray;
     public List<string> jsonList; 
     void Start () {
 
 
         //creating url
         image1Request = new WWW("http://development.someurl.com/MoreGames/MoreGames.json");
         StartCoroutine(ImageOne(image1Request));
     }
 
     IEnumerator ImageOne(WWW www)
     {
         //wait until url is loaded
         yield return www;
         //load image into texture slot
         if (www.error == null)
         {
             //assigning URLS
             var dict = Json.Deserialize(www.text) as Dictionary<string,object>;
             Debug.Log(www.text);
             Debug.Log("deserialized: " + dict.GetType());
             Debug.Log("dict['string']: " + (string)dict["widget"]);
 
         }
 
         else
         {
             Debug.Log("WWW Error: " + www.error);
         }
     }
 }