code: @Override
      public void generateError(String response) {
          extractParameter(response, MESSAGE_REGEX_PATTERN, false);
  
          throw new FacebookAccessTokenErrorResponse(extractParameter(response, MESSAGE_REGEX_PATTERN, false),
                  extractParameter(response, TYPE_REGEX_PATTERN, false),
                  extractParameter(response, CODE_REGEX_PATTERN, false),
                  extractParameter(response, FBTRACE_ID_REGEX_PATTERN, false), response);
      }
docs: non standard. examples:<br>
  
  '{"error":{"message":"This authorization code has been
  used.","type":"OAuthException","code":100,"fbtrace_id":"DtxvtGRaxbB"}}'<br>
  
  '{"error":{"message":"Error validating application. Invalid application
  ID.","type":"OAuthException","code":101,"fbtrace_id":"CvDR+X4WWIx"}}'