Pager Error Invalid file: Pagers(slash)bs_full.php

Try.

PHP Code:

        public $templates = [
                ...
                'bs_full'   => 'App\Views\Pager\bs_full',
                'bs_simple' => 'App\Views\Pager\bs_simple',
    ]; 


where is i can put this? im still new here and i had this problem over a week