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htmlspecialchars() expects parameter 1 - Yii (echmultiselect)

htmlspecialchars() expects parameter 1 to be string, array given C:\xampp\htdocs\yii\framework\web\helpers\CHtml.php(98) 
The error only occurred when trying to apply the echmultiselect filter to the filter above the gridview.

Here's what I did to fix:
1. Went to the Yii framework folder and found the following file: yii\framework\web\helpers\CHtml.php

2. Modifed line 98 from "return htmlspecialchars($text,ENT_QUOTES,Yii::app()->charset);" to:
"return htmlspecialchars(print_r($text, true),ENT_QUOTES,Yii::app()->charset);"

Then you need to implement the echmultiselect extension in the view (my example shows adding it for site_status):

3. Added this php code to the view: $data= CHtml::listData(Nvdaily::model()->findAll(), 'blahblahblah', 'blahblahblah');
(but it should probably be in the model)

4. Made my 'columns' array look like this:
array (
            'filter'=> $this->widget('ext.EchMultiselect.EchMultiselect',
                'model' => $model,
                'dropDownAttribute' => 'blahblahblah',
                'data' => $data,
                'options' => array('buttonWidth' => 80, 'ajaxRefresh' => true),
            true // capture output; needed so the widget displays inside the grid