Warning:  require_once(/srv/www/allesvoorscooters/public/vendor/autoload.php): Failed to open stream: No such file or directory in /srv/www/allesvoorscooters/public/app/Mage.php on line 55

Fatal error:  Uncaught Error: Failed opening required '/srv/www/allesvoorscooters/public/vendor/autoload.php' (include_path='/srv/www/allesvoorscooters/public/app/code/local:/srv/www/allesvoorscooters/public/app/code/community:/srv/www/allesvoorscooters/public/app/code/core:/srv/www/allesvoorscooters/public/lib:.:/usr/share/php') in /srv/www/allesvoorscooters/public/app/Mage.php:55
Stack trace:
#0 /srv/www/allesvoorscooters/public/index.php(43): require_once()
#1 {main}
  thrown in /srv/www/allesvoorscooters/public/app/Mage.php on line 55