Warning: require_once(/code/vendor/composer/autoload_real.php): Failed to open stream: No such file or directory in /code/vendor/autoload.php on line 20

Fatal error: Uncaught Error: Failed opening required '/code/vendor/composer/autoload_real.php' (include_path='.:/usr/share/pear:/usr/share/php') in /code/vendor/autoload.php:20
Stack trace:
#0 /code/web/autoload.php(15): require()
#1 /code/web/index.php(14): require_once('...')
#2 {main}
  thrown in /code/vendor/autoload.php on line 20