This is the error that occurs when I run php /srv/www/htdocs/<wikiname>/maintenance/update.php in MediaWiki Version 1.35:
PHP Fatal error: Uncaught RuntimeException: Circular dependency when creating service! DBLoadBalancerFactory -> MainObjectStash -> DBLoadBalancer -> DBLoadBalancerFactory in /srv/www/htdocs/testwiki/includes/libs/services/ServiceContainer.php:448 Stack trace: #0 /srv/www/htdocs/testwiki/includes/libs/services/ServiceContainer.php(427): Wikimedia\Services\ServiceContainer->createService('DBLoadBalancerF...') #1 /srv/www/htdocs/testwiki/includes/MediaWikiServices.php(679): Wikimedia\Services\ServiceContainer->getService('DBLoadBalancerF...') #2 /srv/www/htdocs/testwiki/includes/ServiceWiring.php(282): MediaWiki\MediaWikiServices->getDBLoadBalancerFactory() #3 /srv/www/htdocs/testwiki/includes/libs/services/ServiceContainer.php(458): Wikimedia\Services\ServiceContainer->{closure}(Object(MediaWiki\MediaWikiServices)) #4 /srv/www/htdocs/testwiki/includes/libs/services/ServiceContainer.php(427): Wikimedia\Services\ServiceContainer->createService('DBLoadBalancer') #5 /srv/www/htdocs/testwiki/includes/MediaWikiServices.php(671): Wiki in /srv/www/htdocs/testwiki/includes/libs/services/ServiceContainer.php on line 448 Fatal error: Uncaught RuntimeException: Circular dependency when creating service! DBLoadBalancerFactory -> MainObjectStash -> DBLoadBalancer -> DBLoadBalancerFactory in /srv/www/htdocs/testwiki/includes/libs/services/ServiceContainer.php:448 Stack trace: #0 /srv/www/htdocs/testwiki/includes/libs/services/ServiceContainer.php(427): Wikimedia\Services\ServiceContainer->createService('DBLoadBalancerF...') #1 /srv/www/htdocs/testwiki/includes/MediaWikiServices.php(679): Wikimedia\Services\ServiceContainer->getService('DBLoadBalancerF...') #2 /srv/www/htdocs/testwiki/includes/ServiceWiring.php(282): MediaWiki\MediaWikiServices->getDBLoadBalancerFactory() #3 /srv/www/htdocs/testwiki/includes/libs/services/ServiceContainer.php(458): Wikimedia\Services\ServiceContainer->{closure}(Object(MediaWiki\MediaWikiServices)) #4 /srv/www/htdocs/testwiki/includes/libs/services/ServiceContainer.php(427): Wikimedia\Services\ServiceContainer->createService('DBLoadBalancer') #5 /srv/www/htdocs/testwiki/includes/MediaWikiServices.php(671): Wiki in /srv/www/htdocs/testwiki/includes/libs/services/ServiceContainer.php on line 448