Fatal error: Uncaught Error: Call to undefined function untrailingslashit() in /var/www/clients/client1/web3/web/wp-includes/option.php:114
Stack trace:
#0 /var/www/clients/client1/web3/web/wp-includes/default-constants.php(116): get_option('siteurl')
#1 /var/www/clients/client1/web3/web/wp-settings.php(166): wp_plugin_directory_constants()
#2 /var/www/clients/client1/web3/web/wp-config.php(82): require_once('/var/www/client...')
#3 /var/www/clients/client1/web3/web/wp-load.php(37): require_once('/var/www/client...')
#4 /var/www/clients/client1/web3/web/wp-blog-header.php(25): require_once('/var/www/client...')
#5 /var/www/clients/client1/web3/web/index.php(12): require('/var/www/client...')
#6 {main}
thrown in /var/www/clients/client1/web3/web/wp-includes/option.php on line 114