This error message relates to the following errors: ERR12 and ERR1800.
The BLERK! ERROR 5 message happens when there's a problem loading AOL Mail. Though often a temporary issue, you can try these steps to get back into your email sooner.
Restart your browser
Sometimes the old "turn it off and on again" solution actually works! Just quit your web browser, and then start it back up again. Once the browser has been restarted, go to mail.aol.com and enter your username and password.
Clear your browser's cache
Another option to fix this error message is to clear your browser's cache. This will wipe out all the little unwanted bits of info that have been stored in your browser, making it run better overall.