Hello, I am new to the forums but not to FFXIV.

So earlier today I updated my client to v2.1 with the intention of playing later. The game updated successfully and I closed it and everything was fine. When I tried starting the game about 30 minutes ago, I was greeted by this lovely error message: http://i.imgur.com/RpJqkZp.png

I searched online but was unable to find any info about it, relating to this game, and have been unsuccessfully able to fix the problem. Any help would be greatly appreciated, as I really want to enter the Crystal Tower. D: