"Unable to fetch restoring points" & "Unable to fetch external locations"

So, after setting up my Nextcloud v24.0.0, I want to set up the backup app to backup to a local, external HDD. I have entered the corresponding path under "External storage". Now when I switch to "Backup" I get two errors: "Unable to fetch restoring points" and "Unable to fetch external locations". I can't select a location.

I copied the following from "Logging":

[no app in context] Error: Exception: OC\DB\QueryBuilder\QueryBuilder::__construct(): Argument #3 ($logger) must be of type Psr\Log\LoggerInterface, OC\Log given, called in /var/www/nextcloud/apps/backup/vendor/artificial-owl/my-small-php-tools/lib/Db/Nextcloud/nc23/NC23ExtendedQueryBuilder.php on line 74 in file '/var/www/nextcloud/lib/private/DB/QueryBuilder/QueryBuilder.php' line 86 at <<closure>>

0. /var/www/nextcloud/lib/private/AppFramework/App.php line 172
   OC\AppFramework\Http\Dispatcher->dispatch()
1. /var/www/nextcloud/lib/private/Route/Router.php line 298
   OC\AppFramework\App::main()
2. /var/www/nextcloud/ocs/v1.php line 62
   OC\Route\Router->match()
3. /var/www/nextcloud/ocs/v2.php line 23
   require_once("/var/www/nextcloud/ocs/v1.php")

GET /ocs/v2.php/apps/backup/r

Does anyone have a solution? Thanks!

Start with apps/backup/vendor/artificial-owl/my-small-php-tools/lib/Db/Nextcloud/nc23/NC23ExtendedQueryBuilder.php at line 74 and the Nextcloud DB QueryBuilder constructor shown in the error. Reproduce the GET /ocs/v2.php/apps/backup/r request, then verify that restoring points and external locations load and a backup location can be selected without either error.