Yii Echmultiselect Showing Error On Console And Not Working

I was following the Option no 3 here https://www.yiiframework.com/extension/echmultiselect#3-use-as-a-filter-in-cgridview to add multiselect dropdown on my Yii project. But it is s

Solution 1:

The problem is in jquery.multiselect.js (EchMultiSelect-v1.3) as the effect method arguments are inverted (at least for the current jQuery version):

.show( effect, speed ) and .hide( effect, speed ) on lines 566, 573, 600 should be replaced by the correct order .show( speed, effect ) and .hide( speed, effect ).