Fatal error: Uncaught Error: Interface 'Drupal\Component\Plugin\Definition\PluginDefinitionInterface' not found in /home/.sites/939/site4167048/web/2020/core/lib/Drupal/Component/Plugin/Definition/PluginDefinition.php:8
Stack trace:
#0 {main}
  thrown in /home/.sites/939/site4167048/web/2020/core/lib/Drupal/Component/Plugin/Definition/PluginDefinition.php on line 8