jui datepicker not visible

Hi all

I have added jui extension using composer but still my calendar control is not visible at run time.

I have used this code to display datepicker on my form:

<?= $form->field($model, ‘dob’)->widget(\yii\jui\DatePicker::classname(), [

  //'language' =&gt; 'ru',


  //'dateFormat' =&gt; 'yyyy-MM-dd',

]) ?>

Could anyone help me out with this?

Thank you