Fatal error: Uncaught Error: Class "Drupal\migrate_drupal\Plugin\migrate\field\FieldPluginBase" not found in /home/www/drupal8/test/core/modules/datetime/src/Plugin/migrate/field/DateField.php:22
Stack trace:
#0 {main}
thrown in /home/www/drupal8/test/core/modules/datetime/src/Plugin/migrate/field/DateField.php on line 22