Warning: require_once(/composer/vendor/autoload.php): Failed to open stream: No such file or directory in /var/www/includes/markdown.php on line 15

Fatal error: Uncaught Error: Failed opening required '/composer/vendor/autoload.php' (include_path='.:/usr/local/lib/php') in /var/www/includes/markdown.php:15 Stack trace: #0 /var/www/includes/router.php(79): require_once() #1 /var/www/includes/router.php(185): render_content_page('/', '/var/www/conten...') #2 /var/www/html/index.php(13): dispatch() #3 {main} thrown in /var/www/includes/markdown.php on line 15