We have inherited a Multisite Drupal setup and are managing the migration for a client. We have the codebase set up locally and have two of the sites up and running. We are hitting an error on the third though:

Symfony\Component\DependencyInjection\Exception\ServiceNotFoundException: The service "redirect.request_subscriber" has a dependency on a non-existent service "path_alias.manager". in Symfony\Component\DependencyInjection\Compiler\CheckExceptionOnInvalidReferenceBehaviorPass->processValue() (line 86 of /Users/{hidden}/Sites/{hidden}/vendor/symfony/dependency-injection/Compiler/CheckExceptionOnInvalidReferenceBehaviorPass.php).

We're not sure why this error is displaying on this one site and not on the others. Can anyone help please? Drupal core is up to date - running 9.3.12.

  • Is the path_alias module enabled? drupal.org/node/3092086 Commented Apr 22, 2022 at 15:13
  • I cannot access this particular site's admin (the whole site is erroring), but running drush pm-list --type=Module --status=enabled tells me that the module is enabled.
    – Tom Aston
    Commented Apr 22, 2022 at 15:32
  • ... however, the fact that the path_alias and path_alias_revision database tables do not exist for this site suggests otherwise!
    – Tom Aston
    Commented Apr 22, 2022 at 15:48
  • Then the database is not in syn with the codebase. You can try if update.php can fix this, but if there is such a big gap I doubt it works. If you can't log in anymore you can grant access to update.php in settings.php
    – 4uk4
    Commented Apr 22, 2022 at 15:52
  • I'd uninstall the module in question and then enable it so it goes through the installation process properly. I've seen this happen before but never worked out why, but turning it off and on again :) seems to do the trick. Commented Apr 22, 2022 at 16:00

1 Answer 1


For me, a search and replace in the .sql file changed path_alias.manager data entries unwanted ... so needed to get my data back right ..

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