Warning: require(/var/www/m2/pub/../app/bootstrap.php): failed to open stream: No such file or directory in /var/www/m2/pub/index.php on line 13

Fatal error: require(): Failed opening required '/var/www/m2/pub/../app/bootstrap.php' (include_path='.:/usr/share/php') in /var/www/m2/pub/index.php on line 13