Fatal error: Uncaught Error: Class "Drupal\mysql\Driver\Database\mysql\ExceptionHandler" not found in /var/www/html/core/modules/mysql/src/Driver/Database/mysql/Connection.php:393 Stack trace: #0 /var/www/html/core/lib/Drupal/Core/Database/Connection.php(883): Drupal\mysql\Driver\Database\mysql\Connection->exceptionHandler() #1 /var/www/html/core/lib/Drupal/Core/Config/DatabaseStorage.php(115): Drupal\Core\Database\Connection->query() #2 /var/www/html/core/lib/Drupal/Core/Config/CachedStorage.php(95): Drupal\Core\Config\DatabaseStorage->readMultiple() #3 /var/www/html/core/lib/Drupal/Core/Config/ConfigFactory.php(165): Drupal\Core\Config\CachedStorage->readMultiple() #4 /var/www/html/core/lib/Drupal/Core/Config/ConfigFactory.php(104): Drupal\Core\Config\ConfigFactory->doLoadMultiple() #5 /var/www/html/core/lib/Drupal/Core/Config/ConfigFactory.php(89): Drupal\Core\Config\ConfigFactory->doGet() #6 /var/www/html/core/lib/Drupal.php(414): Drupal\Core\Config\ConfigFactory->get() #7 /var/www/html/core/includes/errors.inc(330): Drupal::config() #8 /var/www/html/core/includes/errors.inc(122): _drupal_get_error_level() #9 /var/www/html/core/includes/errors.inc(214): error_displayable() #10 /var/www/html/core/includes/errors.inc(70): _drupal_log_error() #11 /var/www/html/core/includes/bootstrap.inc(166): _drupal_error_handler_real() #12 /var/www/html/vendor/composer/ClassLoader.php(576): _drupal_error_handler() #13 /var/www/html/vendor/composer/ClassLoader.php(576): include('...') #14 /var/www/html/vendor/composer/ClassLoader.php(427): Composer\Autoload\{closure}() #15 /var/www/html/core/modules/mysql/src/Driver/Database/mysql/Connection.php(393): Composer\Autoload\ClassLoader->loadClass() #16 /var/www/html/core/lib/Drupal/Core/Database/Connection.php(883): Drupal\mysql\Driver\Database\mysql\Connection->exceptionHandler() #17 /var/www/html/core/lib/Drupal/Core/Config/DatabaseStorage.php(115): Drupal\Core\Database\Connection->query() #18 /var/www/html/core/lib/Drupal/Core/Config/CachedStorage.php(95): Drupal\Core\Config\DatabaseStorage->readMultiple() #19 /var/www/html/core/lib/Drupal/Core/Config/ConfigFactory.php(165): Drupal\Core\Config\CachedStorage->readMultiple() #20 /var/www/html/core/lib/Drupal/Core/Config/ConfigFactory.php(104): Drupal\Core\Config\ConfigFactory->doLoadMultiple() #21 /var/www/html/core/lib/Drupal/Core/Config/ConfigFactory.php(89): Drupal\Core\Config\ConfigFactory->doGet() #22 /var/www/html/core/lib/Drupal.php(414): Drupal\Core\Config\ConfigFactory->get() #23 /var/www/html/core/includes/errors.inc(330): Drupal::config() #24 /var/www/html/core/includes/errors.inc(122): _drupal_get_error_level() #25 /var/www/html/core/includes/bootstrap.inc(204): error_displayable() #26 /var/www/html/core/includes/bootstrap.inc(188): _drupal_exception_handler_additional() #27 [internal function]: _drupal_exception_handler() #28 {main} thrown in /var/www/html/core/modules/mysql/src/Driver/Database/mysql/Connection.php on line 393