How do I fix a “Mismatched entity and/or field definitions” error on my configuration?

Question

I'm getting the following error on my Drupal 8 configuration page;

Entity/field definitions Mismatched entity and/or field definitions The following changes were detected in the entity type and field definitions. Content

Update the node.rng_capacity field.
Update the node.rng_registrants_duplicate field.
Update the node.rng_registration_groups field.
Update the node.rng_registration_type field.
Update the node.rng_reply_to field.
Update the node.rng_status field.

I'm not sure what caused these issues or how to go about resolving them - I think they may be leftover fragments/elements from when I deleted a registration or entity type maybe?

Answer 1

You can solve this issue by two ways If you have Drush -

drush entity-updates

If you don't use Drush add following script before $response->send(); in index.php file(located in Drupal root folder) and reload the web page.

try {
  \Drupal::entityDefinitionUpdateManager()->applyUpdates();
}
catch (EntityStorageException $e) {
  print_r($e);
}

Then remove this code from index.php file.

Answer 2

For Drupal 9 use this Module to do the entity update (with or without drush):

Entity Update

https://www.drupal.org/project/entity_update