Warning: Class "Drupal\Core\Http\KernelEvent" not found in /home/clients/34bc0dd967172ce30af7dbc8b0dccfd3/drupal/web/core/includes/bootstrap.inc on line 135

Fatal error: Uncaught Error: Class "Symfony\Component\EventDispatcher\Event" not found in /home/clients/34bc0dd967172ce30af7dbc8b0dccfd3/drupal/web/core/lib/Drupal/Component/EventDispatcher/Event.php:15 Stack trace: #0 /home/clients/34bc0dd967172ce30af7dbc8b0dccfd3/drupal/vendor/composer/ClassLoader.php(576): include() #1 /home/clients/34bc0dd967172ce30af7dbc8b0dccfd3/drupal/vendor/composer/ClassLoader.php(427): Composer\Autoload\{closure}('/home/clients/3...') #2 /home/clients/34bc0dd967172ce30af7dbc8b0dccfd3/drupal/web/core/lib/Drupal/Core/Http/KernelEvent.php(20): Composer\Autoload\ClassLoader->loadClass('Drupal\\Componen...') #3 /home/clients/34bc0dd967172ce30af7dbc8b0dccfd3/drupal/vendor/composer/ClassLoader.php(576): include('/home/clients/3...') #4 /home/clients/34bc0dd967172ce30af7dbc8b0dccfd3/drupal/vendor/composer/ClassLoader.php(427): Composer\Autoload\{closure}('/home/clients/3...') #5 [internal function]: Composer\Autoload\ClassLoader->loadClass('Drupal\\Core\\Htt...') #6 /home/clients/34bc0dd967172ce30af7dbc8b0dccfd3/drupal/web/core/includes/bootstrap.inc(135): class_alias('Drupal\\Core\\Htt...', 'Symfony\\Compone...', true) #7 /home/clients/34bc0dd967172ce30af7dbc8b0dccfd3/drupal/vendor/composer/autoload_real.php(45): require('/home/clients/3...') #8 /home/clients/34bc0dd967172ce30af7dbc8b0dccfd3/drupal/vendor/composer/autoload_real.php(49): {closure}('2f69d3914119f04...', '/home/clients/3...') #9 /home/clients/34bc0dd967172ce30af7dbc8b0dccfd3/drupal/vendor/autoload.php(25): ComposerAutoloaderInitacd5e6377ea6c5c47401fc9e0a47f27b::getLoader() #10 /home/clients/34bc0dd967172ce30af7dbc8b0dccfd3/drupal/web/autoload.php(17): require('/home/clients/3...') #11 /home/clients/34bc0dd967172ce30af7dbc8b0dccfd3/drupal/web/index.php(14): require_once('/home/clients/3...') #12 {main} thrown in /home/clients/34bc0dd967172ce30af7dbc8b0dccfd3/drupal/web/core/lib/Drupal/Component/EventDispatcher/Event.php on line 15