None of this simple tier one support is helping, and there is a problem with the launcher or game. Many people that have this error, me included, have tried many things to get the error to go away.
We don't have Mactype installed
We don't have mods installed
We have fresh installs of the game, and some people even OS
We have renamed the user folder for FFXIV or just out deleted it
No overclocking of GPU and CPU (even though that should not matter)
The only thing that seems to work, is launching the game through G-Force Experience.

No clue why that works, but it does. I would love to just launch the game normally, please look into this further then "reboot your PC"