I received this email from submitting a ticket will the support center...

Thank you for contacting the North American SQUARE ENIX Support Center. We appreciate you taking the time to contact us for assistance.

We apologize for any inconvenience you may be experiencing while attempting to log in. This specific error is an error regarding character data. The error is most commonly caused by an improper disconnection from the servers during gameplay. As the game servers still recognize the character as being logged in due to the improper disconnection, the character cannot be logged into again. Unfortunately, there is no manual way to communicate to the servers that the character is no longer logged in, nor is there a way to manually log the character out. The character will eventually be recognized as logged out, though this time can vary depending on multiple factors, such as the area the character was in when the disconnection happened. We recommend trying to log into that character at a later time, but if the problem persists, please submit a bug report within the official FINAL FANTASY XIV forums at: http://forum.square-enix.com/ffxiv/forum.php