Fatal error: Uncaught Error: Class "Drupal\views\Plugin\Block\ViewsBlockBase" not found in /home/www/drupal8/test/core/modules/views/src/Plugin/Block/ViewsBlock.php:19 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/modules/views/src/Plugin/Block/ViewsBlock.php on line 19