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At first install official JUI Extension for Yii 2 . Then add yii\jui\JuiAsset to list of dependent assets: public $depends = [ 'yii\jui\JuiAsset' , ... ];

Be sure you have a proper rules function declare in Search model eg: public function rules () { return [ [[ 'id_materia' ], 'integer' ], [[ 'nombre_sucursal' , 'materia' ], 'safe' ], ]; }