Unhandled Exception when trying to enable circles

[Af0x]

Hello,

I get the following error when trying to enable circles. Had to disable it because there was an Internal Server Error preventing the webinterface to load:

occ app:enable circles
An unhandled exception has been thrown:
Error: Class "OCA\Circles\Model\Circle" not found in /path/to/nextcloud/apps/circles/lib/Service/FederatedUserService.php:573
Stack trace:
#0 /path/to/nextcloud/apps/circles/lib/Service/MigrationService.php(195): OCA\Circles\Service\FederatedUserService->getAppInitiator()
#1 /path/to/nextcloud/apps/circles/lib/Migration/Migration.php(97): OCA\Circles\Service\MigrationService->migration()
#2 /path/to/nextcloud/lib/private/Repair.php(124): OCA\Circles\Migration\Migration->run()
#3 /path/to/nextcloud/lib/private/legacy/OC_App.php(838): OC\Repair->run()
#4 /path/to/nextcloud/lib/private/Installer.php(141): OC_App::executeRepairSteps()
#5 /path/to/nextcloud/core/Command/App/Enable.php(110): OC\Installer->installApp()
#6 /path/to/nextcloud/core/Command/App/Enable.php(80): OC\Core\Command\App\Enable->enableApp()
#7 /path/to/nextcloud/3rdparty/symfony/console/Command/Command.php(298): OC\Core\Command\App\Enable->execute()
#8 /path/to/nextcloud/3rdparty/symfony/console/Application.php(1040): Symfony\Component\Console\Command\Command->run()
#9 /path/to/nextcloud/3rdparty/symfony/console/Application.php(301): Symfony\Component\Console\Application->doRunCommand()
#10 /path/to/nextcloud/3rdparty/symfony/console/Application.php(171): Symfony\Component\Console\Application->doRun()
#11 /path/to/nextcloud/lib/private/Console/Application.php(213): Symfony\Component\Console\Application->run()
#12 /path/to/nextcloud/console.php(102): OC\Console\Application->run()
#13 /path/to/nextcloud/occ(11): require_once('...')

The issue first occurred after upgrading from nextcloud-28.0.5.1 to nextcloud-28.0.6.1 and persists after upgrading to Nextcloud 29.0.1.