title: Yii echmultiselect showing error on console and not working
body: <p>I was following the <strong>Option no 3</strong> here <a href="https://www.yiiframework.com/extension/echmultiselect#3-use-as-a-filter-in-cgridview" rel="nofollow noreferrer">https://www.yiiframework.com/extension/echmultiselect#3-use-as-a-filter-in-cgridview</a> to add multiselect dropdown on my Yii project. But it is showing,</p>
  
  <blockquote>
    <p>jquery.js:6920 Uncaught TypeError: jQuery.easing[this.easing] is not a
    function
        at init.run (jquery.js:6920)</p>
  </blockquote>
  
  <p>On my <strong>cgridview</strong>, this is the column that has to be multiple select checkbox,</p>
  
  <pre><code>array (
                  'name'=&gt;'brand_id',
                  'filter'=&gt; $this-&gt;widget('ext.EchMultiSelect.EchMultiSelect', array(
                      'model' =&gt; $model,
                      'dropDownAttribute' =&gt; 'brand_id',
                      'data' =&gt; CHtml::listData(Brands::model()-&gt;findAll(array("order" =&gt; "sortOrder")), 'id', 'name'),
                      'options' =&gt; array('buttonWidth' =&gt; 80, 'ajaxRefresh' =&gt; true,'filter'=&gt;true),
                  ),
                      true // capture output; needed so the widget displays inside the grid
                  ),
             ),
  </code></pre>
  
  <p>On my <strong>layout</strong>,</p>
  
  <p>I've included the jquery,</p>
  
  <pre><code>&lt;?php Yii::app()-&gt;clientScript-&gt;registerCoreScript('jquery'); ?&gt;
  </code></pre>
  
  <p><strong>Dropdown page:</strong></p>
  
  <p><a href="https://i.stack.imgur.com/RhbgA.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/RhbgA.png" alt="enter image description here"></a></p>
  
  <p>Because of that jQuery.easing[this.easing] is not a function error the multi-select functionality is not working, as per the suggestion here: <a href="https://stackoverflow.com/a/12592301/1138192">https://stackoverflow.com/a/12592301/1138192</a> I've added the jquery UI also but it doesn't work even it breaks the existing dropdown.</p>
  
  <p><strong>Error on the console:</strong></p>
  
  <p><a href="https://i.stack.imgur.com/CtGlF.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/CtGlF.png" alt="enter image description here"></a></p>