Drupal8 - Unable to determine class for field...
One possible way is that your module is missing from the codebase or has been improperly uninstalled and you’ve still a field which is using that missing module. Try the following drush commands to remove the broken field: drush sqlq "DELETE FROM cache_config" drush sqlq "DELETE FROM config WHERE name = 'field.storage.xxx.xxx' OR data LIKE '%field.storage.xxx.xxx%'" drush sqlq "DELETE FROM config_snapshot WHERE name = 'field.storage.xxx.xxx' OR data LIKE '%field.storage.xxx.xxx%'" Warning: Don’t execute above commands on master/live database.
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