Additional uncaught exception thrown while handling exception.

Original

Drupal\Core\Database\DatabaseExceptionWrapper: SQLSTATE[HY000]: General error: 2006 MySQL server has gone away: SELECT 1 FROM information_schema.tables WHERE ("table_schema" = :db_condition_placeholder_0) AND ("table_name" = :db_condition_placeholder_1); Array ( [:db_condition_placeholder_0] => pantheon [:db_condition_placeholder_1] => config ) in Drupal\Core\Config\DatabaseStorage->read() (line 96 of /code/web/core/lib/Drupal/Core/Config/DatabaseStorage.php).

Drupal\Core\Config\DatabaseStorage->read('core.extension') (Line: 622)
Drupal\Core\DrupalKernel->discoverServiceProviders() (Line: 1340)
Drupal\Core\DrupalKernel->initializeServiceProviders() (Line: 1241)
Drupal\Core\DrupalKernel->compileContainer() (Line: 934)
Drupal\Core\DrupalKernel->initializeContainer() (Line: 494)
Drupal\Core\DrupalKernel->boot() (Line: 702)
Drupal\Core\DrupalKernel->handle(Object) (Line: 19)

Additional

Error: Call to undefined function install_display_output() in _drupal_log_error() (line 271 of /code/web/core/includes/errors.inc).

_drupal_log_error(Array, 1) (Line: 182)
_drupal_exception_handler(Object)