If you're seeing a "GAH Error 1111" message when signing in to AOL Mail, there are a couple quick fixes you can try to get you back in to your account.

Change your password

The easiest way to fix this problem is to change your AOL password. Once you've reset your password, make sure you sign in again at mail.aol.com.

Clear your web browser's cache

If you're still unable to access your mail after resetting the password and signing in from the mail site, you'll need to clear your browser's cache. Once you've cleared your cache, make sure you quit and restart your browser before trying to sign in again at mail.aol.com.