When upgrading to Drupal 9 you can encounter the following issue:
In Container.php line 151:
You have requested a non-existent service "entity.manager".
Solution: look up every appearance of "entity.manager" in your code. The module probably has a newer version for Drupal 9 and older.
I had to upgrade drupal/webform to ^6.0.0.
Or look in code for deprecated
$container->get('entity.manager')
and change to
$container->get('entity_type.manager')
Need more help upgrading?
https://stefvanlooveren.me/blog/how-upgrade-drupal-8-9-composer
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