Warning: include(/var/www/html/vendor/composer/../symfony/event-dispatcher/Event.php): Failed to open stream: No such file or directory in /var/www/html/vendor/composer/ClassLoader.php on line 571

Warning: include(): Failed opening '/var/www/html/vendor/composer/../symfony/event-dispatcher/Event.php' for inclusion (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/ClassLoader.php on line 571

Warning: Class "Drupal\Core\Http\KernelEvent" not found in /var/www/html/web/core/includes/bootstrap.inc on line 135

Fatal error: Uncaught Error: Class "Symfony\Component\EventDispatcher\Event" not found in /var/www/html/web/core/lib/Drupal/Component/EventDispatcher/Event.php:15 Stack trace: #0 /var/www/html/vendor/composer/ClassLoader.php(571): include() #1 /var/www/html/vendor/composer/ClassLoader.php(428): Composer\Autoload\includeFile('/var/www/html/v...') #2 /var/www/html/web/core/lib/Drupal/Core/Http/KernelEvent.php(20): Composer\Autoload\ClassLoader->loadClass('Drupal\\Componen...') #3 /var/www/html/vendor/composer/ClassLoader.php(571): include('/var/www/html/w...') #4 /var/www/html/vendor/composer/ClassLoader.php(428): Composer\Autoload\includeFile('/var/www/html/v...') #5 [internal function]: Composer\Autoload\ClassLoader->loadClass('Drupal\\Core\\Htt...') #6 /var/www/html/web/core/includes/bootstrap.inc(135): class_alias('Drupal\\Core\\Htt...', 'Symfony\\Compone...', true) #7 /var/www/html/vendor/composer/autoload_real.php(59): require('/var/www/html/w...') #8 /var/www/html/vendor/composer/autoload_real.php(42): composerRequireb4bb3c43f92f255d084c9af12945100d('2f69d3914119f04...', '/var/www/html/v...') #9 /var/www/html/vendor/autoload.php(12): ComposerAutoloaderInitb4bb3c43f92f255d084c9af12945100d::getLoader() #10 /var/www/html/web/autoload.php(16): require('/var/www/html/v...') #11 /var/www/html/web/index.php(14): require_once('/var/www/html/w...') #12 {main} thrown in /var/www/html/web/core/lib/Drupal/Component/EventDispatcher/Event.php on line 15