window.YT.Player is not a constructor about jquery.youtubebackground HOT 1 OPEN

iframeIsReady = function iframeIsReady(callback) {
      // Listen for Gobal YT player callback
      if (typeof YT === 'undefined' && typeof window.loadingPlayer === 'undefined') {
        // Prevents Ready Event from being called twice
        window.loadingPlayer = true;

        
        // Creates deferred so, other players know when to wait.
        window.dfd = $.Deferred();
        window.onYouTubeIframeAPIReady = function() {
          window.onYouTubeIframeAPIReady = null;
          window.dfd.resolve( "done" );
          callback();
        };
      } else if (typeof YT === 'object')  {
        if(typeof YT.Player !== 'undefined'){
          callback();
        } else{
          window.dfd = $.Deferred();
          window.onYouTubeIframeAPIReady = function() {
            window.onYouTubeIframeAPIReady = null;
            window.dfd.resolve( "done" );
            callback();
          };
        }
        
      } else {
        window.dfd.done(function( name ) {
          callback();
        });
      }
    };