How do I switch light and dark mode in modes and routines (oneui 7)?

https://preview.redd.it/xogc2mkredze1.png?width=1440&format=png&auto=webp&s=46918640364068c634c11dd83fe0ea855ec2c7b5

I would like to automatically switch between light mode and dark mode in modes and routines, but it keep saying "couldn't perform this action because another operation is preventing it". I don't even know what "operation" prevents it. Any idea?