Really don’t know what to do. Just put the backup of the website back to get it working again.
After updating to 9.1.4 the following message is shown:
Fatal error : Uncaught Error: Call to undefined function cornerstone_register_static_style() in /home/customer/www/metzenergy.nl/public_html/wp-content/themes/x/framework/legacy/functions/frontend/styles.php:93 Stack trace: #0 /home/customer/www/metzenergy.nl/public_html/wp-includes/class-wp-hook.php(303): x_output_generated_styles(’’) #1 /home/customer/www/metzenergy.nl/public_html/wp-includes/class-wp-hook.php(327): WP_Hook->apply_filters(NULL, Array) #2 /home/customer/www/metzenergy.nl/public_html/wp-includes/plugin.php(470): WP_Hook->do_action(Array) #3 /home/customer/www/metzenergy.nl/public_html/wp-includes/script-loader.php(2083): do_action(‘wp_enqueue_scri…’) #4 /home/customer/www/metzenergy.nl/public_html/wp-includes/class-wp-hook.php(303): wp_enqueue_scripts(’’) #5 /home/customer/www/metzenergy.nl/public_html/wp-includes/class-wp-hook.php(327): WP_Hook->apply_filters(NULL, Array) #6 /home/customer/www/metzenergy.nl/public_html/wp-includes/plugin.php(470): WP_Hook->do_action(Array) #7 /home/customer/www/metzener in /home/customer/www/metzenergy.nl/public_html/wp-content/themes/x/framework/legacy/functions/frontend/styles.php on line 93
There has been a critical error on this website.