Blerk error in AOL Mail signifies that the users are not able to sign in to the mail due to some underlying issues. It can be due to browser troubles when the default browser is not updated. If you are accessing AOL mail through AOL Desktop platform, it is suggested that you update the desktop application. Also, ensure the net settings and see that the system is acquiring proper connectivity. Clear the junk files from the system and delete the browser's cookies, cache, and history. If nothing works, then dial aol email customer care number and resolve the queries with the technical experts.