Fatal error: Uncaught Error: Call to undefined function Drupal\Core\drupal_valid_test_ua() in /var/www/html/docroot/core/lib/Drupal/Core/DrupalKernel.php:1028 Stack trace: #0 /var/www/html/docroot/core/lib/Drupal/Core/DrupalKernel.php(696): Drupal\Core\DrupalKernel::bootEnvironment() #1 /var/www/html/docroot/index.php(19): Drupal\Core\DrupalKernel->handle() #2 {main} thrown in /var/www/html/docroot/core/lib/Drupal/Core/DrupalKernel.php on line 1028