Problem with unity ads

Hi all, I am having a problem with unity ads. When i call for an ad, a add is prompted but it's not a real app just an add for unity. pic of the ad: https://drive.google.com/open?id=0B7JcBeBehMJ-R1F1eWVHWW9adWtPeXRFTHRNQ1NjQVN6YTJj

code:

 function OnCollisionEnter2D(myCol : Collision2D)
 {
      if(myCol.gameObject.tag == "cube" && lives == 0)
      {
            ShowAd();
      }  
 }
 
 
 
 
 
 function ShowAd() 
 {
     if (!Advertisement.IsReady()) 
     {
         return;
     }
     Advertisement.Show();
 }