WWW No valid crossdomain policy available to allow access

I'm basically getting the following error:

 SecurityException: No valid crossdomain policy available to allow access
 UnityEngine.WWW.get_text () (at C:/BuildAgent/work/d3d49558e4d408f4/artifacts/EditorGenerated/Utils.cs:171)
 DataHandler.GetChannelProperty (System.String property) (at Assets/Scripts/DataScripts/DataHandler.cs:21)
 GameMaster.Start () (at Assets/Scripts/GameScripts/GameMaster.cs:28)

Which is resulted by the following scripts. It's worth noting that i'm exporting to Unity Webplayer.

DataHandler:

 using UnityEngine;
 using System.Collections;
 
 public class DataHandler : MonoBehaviour {
 
     public static DataHandler self;
 
     void Awake() {
         self = this;
     }
 
     public string GetChannelProperty(string property) {
         int channelID = 6;
         string urlRequest = "HIDDEN FOR MY SECURITY PURPOSE";
 
         WWW request = new WWW(urlRequest);
         StartCoroutine(YieldRequest(request));
 
         while(!request.isDone) {}
 
         return request.text;
     }
 
     private IEnumerator YieldRequest(WWW request) {
         yield return request;
     }
 
 }

GameMaster:

 .....
     void Start() {
             ChannelName = DataHandler.self.GetChannelProperty("channel_name");
         }
 .....