Warning: require(/var/www/school/vendor/composer/../symfony/polyfill-mbstring/bootstrap.php): Failed to open stream: No such file or directory in /var/www/school/vendor/composer/autoload_real.php on line 41

Fatal error: Uncaught Error: Failed opening required '/var/www/school/vendor/composer/../symfony/polyfill-mbstring/bootstrap.php' (include_path='.:/usr/share/php') in /var/www/school/vendor/composer/autoload_real.php:41 Stack trace: #0 /var/www/school/vendor/composer/autoload_real.php(45): {closure:ComposerAutoloaderInita5c1642d797447fd2367f3169a8d9304::getLoader():37}() #1 /var/www/school/vendor/autoload.php(25): ComposerAutoloaderInita5c1642d797447fd2367f3169a8d9304::getLoader() #2 /var/www/school/public/index.php(39): require('...') #3 {main} thrown in /var/www/school/vendor/composer/autoload_real.php on line 41