@TeamYouTube yes i have recently tried to start a YouTube channel (no videos yet) and when i try to costumize my channel with a banner it says to sign in and then says error
That's odd! What device are you on? If you're on a browser, try clearing the cache and cookies. If you're on a mobile device, try these steps: delete the app > restart your device > reinstall the app. This usually clears things up but let us know if it's still not working!