Warning: include(/opt/drupal/web/core/lib/Drupal/Core/DrupalKernel.php): Failed to open stream: No such file or directory in /opt/drupal/web/vendor/composer/ClassLoader.php on line 576

Warning: include(): Failed opening '/opt/drupal/web/vendor/composer/../../core/lib/Drupal/Core/DrupalKernel.php' for inclusion (include_path='/opt/drupal/web/vendor/pear/archive_tar:/opt/drupal/web/vendor/pear/console_getopt:/opt/drupal/web/vendor/pear/pear-core-minimal/src:/opt/drupal/web/vendor/pear/pear_exception:.:/usr/local/lib/php') in /opt/drupal/web/vendor/composer/ClassLoader.php on line 576

Fatal error: Uncaught Error: Class "Drupal\Core\DrupalKernel" not found in /opt/drupal/web/index.php:16 Stack trace: #0 {main} thrown in /opt/drupal/web/index.php on line 16