Warning: include(/opt/drupal/vendor/composer/../../web/core/lib/Drupal/Core/DrupalKernel.php): failed to open stream: Permission denied in /opt/drupal/vendor/composer/ClassLoader.php on line 444

Warning: include(): Failed opening '/opt/drupal/vendor/composer/../../web/core/lib/Drupal/Core/DrupalKernel.php' for inclusion (include_path='/opt/drupal/vendor/pear/pear_exception:/opt/drupal/vendor/pear/console_getopt:/opt/drupal/vendor/pear/pear-core-minimal/src:/opt/drupal/vendor/pear/archive_tar:.:/usr/local/lib/php') in /opt/drupal/vendor/composer/ClassLoader.php on line 444

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