Wishlist Counter

Hello! I am trying to put a counter of the wishlist on my menu but i get a fatal error with the code bellow:

function yith_wcwl_ajax_update_count(){
	wp_send_json( array(
		'count' => yith_wcwl_count_products(),
	) );
}
add_action( 'wp_ajax_yith_wcwl_update_wishlist_count', 'yith_wcwl_ajax_update_count' );
add_action( 'wp_ajax_nopriv_yith_wcwl_update_wishlist_count', 'yith_wcwl_ajax_update_count' );

Did I type something wrong.