Hello @simplewpplugins
I take this:
[03-Dec-2023 15:59:09 UTC] PHP Fatal error: Uncaught ArgumentCountError: Too few arguments to function {closure}(), 3 passed in /home/www/healthga/moschatobook.gr/www/wp-includes/class-wp-hook.php on line 324 and exactly 4 expected in /home/www/healthga/moschatobook.gr/www/wp-content/themes/blocksy/inc/components/menus.php:340
Stack trace: 0 /home/www/healthga/moschatobook.gr/www/wp-includes/class-wp-hook.php(324): {closure}(Array, Object(WP_Post), Object(stdClass)) 1 /home/www/healthga/moschatobook.gr/www/wp-includes/plugin.php(205): WP_Hook->apply_filters(Array, Array) 2 /home/www/healthga/moschatobook.gr/www/wp-content/plugins/simple-slideout-menu/includes/simsm-walker.php(25): apply_filters(‘nav_menu_css_cl…’, Array, Object(WP_Post), Object(stdClass)) 3 /home/www/healthga/moschatobook.gr/www/wp-includes/class-wp-walker.php(147): Simsm_Menu_Walker->start_el(”, Object(WP_Post), 0, Object(stdClass)) 4 /home/www/healthga/moschatobook.gr/www/wp-includes/class-wp-walker.php(247): Walker->display_element(Object(WP_Post), Array, 3, 0, Array, ”) 5 in /home/www/healthga/moschatobook.gr/www/wp-content/themes/blocksy/inc/components/menus.php on line 340
I tried with Astra free theme and it worked properly. I think there is a conflict with Blocksy.