Apple TV and YouTube Favorites

I'm having some problems with saving and removing favorites from youtube in apple tv 1st generation.

Now I receive a new message, that I never saw.

Remove account from apple tv, or retype password or ....

Can anyone explain, what I have to do ?

I have youtube in imac and iphone. The login is from a gmail account. The older login is no longer active.

I see my favorites and subscriptions in apple tv and I can login, without any problem.

But when I try to remove or add, that meesage with various option appear.