Fatal error: Uncaught Error: Class "Drupal\Tests\Core\Entity\StubEntityBase" not found in /home/qcsvlel/www/core/tests/Drupal/Tests/Core/Entity/StubRevisionableEntity.php:13 Stack trace: #0 {main} thrown in /home/qcsvlel/www/core/tests/Drupal/Tests/Core/Entity/StubRevisionableEntity.php on line 13