docs: function (viewId, requirePath, err) {
              var that = this,
                  message = 'View Not Found. Searched for "' + viewId + '" via path "' + requirePath + '".';
  
              return system.defer(function(dfd) {
                  dfd.resolve(that.processMarkup('<div class="durandal-view-404">' + message + '</div>'));
              }).promise();
          }