I already use my site url but showing me this

{
   "error": {
      "message": "Can't load URL: The domain of this URL isn't included in the app's domains. To be able to load this URL, add all domains and sub-domains of your app to the App Domains field in your app settings.",
      "type": "OAuthException",
      "code": 191,
      "fbtrace_id": "AszEOHkBibIrpU-jaXNZ754"
   }
}