add_action('wp_footer', function () { echo ''; }, 99);
Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, class Posts_Manager_Pro_Core_73 does not have a method "enqueue_front" in /var/www/vhosts/mrloyalbrand.com/httpdocs/wp-includes/class-wp-hook.php:353
Stack trace:
#0 /var/www/vhosts/mrloyalbrand.com/httpdocs/wp-includes/class-wp-hook.php(377): WP_Hook->apply_filters()
#1 /var/www/vhosts/mrloyalbrand.com/httpdocs/wp-includes/plugin.php(523): WP_Hook->do_action()
#2 /var/www/vhosts/mrloyalbrand.com/httpdocs/wp-includes/script-loader.php(2340): do_action()
#3 /var/www/vhosts/mrloyalbrand.com/httpdocs/wp-includes/class-wp-hook.php(353): wp_enqueue_scripts()
#4 /var/www/vhosts/mrloyalbrand.com/httpdocs/wp-includes/class-wp-hook.php(377): WP_Hook->apply_filters()
#5 /var/www/vhosts/mrloyalbrand.com/httpdocs/wp-includes/plugin.php(523): WP_Hook->do_action()
#6 /var/www/vhosts/mrloyalbrand.com/httpdocs/wp-includes/general-template.php(3441): do_action()
#7 /var/www/vhosts/mrloyalbrand.com/httpdocs/wp-content/themes/webstijl-pro/header.php(22): wp_head()
#8 /var/www/vhosts/mrloyalbrand.com/httpdocs/wp-includes/template.php(880): require_once('...')
#9 /var/www/vhosts/mrloyalbrand.com/httpdocs/wp-includes/template.php(815): load_template()
#10 /var/www/vhosts/mrloyalbrand.com/httpdocs/wp-includes/general-template.php(48): locate_template()
#11 /var/www/vhosts/mrloyalbrand.com/httpdocs/wp-content/themes/webstijl-pro/index.php(15): get_header()
#12 /var/www/vhosts/mrloyalbrand.com/httpdocs/wp-includes/template-loader.php(132): include('...')
#13 /var/www/vhosts/mrloyalbrand.com/httpdocs/wp-blog-header.php(19): require_once('...')
#14 /var/www/vhosts/mrloyalbrand.com/httpdocs/index.php(17): require('...')
#15 {main}
thrown in /var/www/vhosts/mrloyalbrand.com/httpdocs/wp-includes/class-wp-hook.php on line 353