Hi,
If you using php 5.3 or older version then you can go to plugins\wp-responsive-menu\inc\wprmclass.php file. Reach on line no 6, replace this line :- public $translatables = [ ‘search_box_text’, ‘bar_title’ ];
with
public $translatables = array( ‘search_box_text’, ‘bar_title’ );
