Warning: require(/var/www/html/vendor/composer/../symfony/polyfill-mbstring/bootstrap.php): Failed to open stream: Permission denied in /var/www/html/vendor/composer/autoload_real.php on line 41

Fatal error: Uncaught Error: Failed opening required '/var/www/html/vendor/composer/../symfony/polyfill-mbstring/bootstrap.php' (include_path='.:/usr/local/lib/php') in /var/www/html/vendor/composer/autoload_real.php:41 Stack trace: #0 /var/www/html/vendor/composer/autoload_real.php(45): {closure}('0e6d7bf4a5811bf...', '/var/www/html/v...') #1 /var/www/html/vendor/autoload.php(25): ComposerAutoloaderInit96fcd35e57c474ed9a5678bff9997d8b::getLoader() #2 /var/www/html/config/bootstrap.php(19): require_once('/var/www/html/v...') #3 /var/www/html/public/index.php(22): require_once('/var/www/html/c...') #4 {main} thrown in /var/www/html/vendor/composer/autoload_real.php on line 41