Warning: require(/var/www/html/vendor/composer/../symfony/polyfill-mbstring/bootstrap.php): Failed to open stream: No such file or directory in /var/www/html/vendor/composer/autoload_real.php on line 59

Fatal error: Uncaught Error: Failed opening required '/var/www/html/vendor/composer/../symfony/polyfill-mbstring/bootstrap.php' (include_path='/var/www/html/vendor/pear/archive_tar:/var/www/html/vendor/pear/console_getopt:/var/www/html/vendor/pear/pear-core-minimal/src:/var/www/html/vendor/pear/pear_exception:.:/usr/local/lib/php') in /var/www/html/vendor/composer/autoload_real.php:59 Stack trace: #0 /var/www/html/vendor/composer/autoload_real.php(42): composerRequirecc4ee3752f91cf1a7adbf671780705a0('0e6d7bf4a5811bf...', '/var/www/html/v...') #1 /var/www/html/vendor/autoload.php(12): ComposerAutoloaderInitcc4ee3752f91cf1a7adbf671780705a0::getLoader() #2 /var/www/html/docroot/autoload.php(16): require('/var/www/html/v...') #3 /var/www/html/docroot/index.php(14): require_once('/var/www/html/d...') #4 {main} thrown in /var/www/html/vendor/composer/autoload_real.php on line 59