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


and change to


Need more help upgrading?



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