The Support team were really helpful, they sent me these steps to solve the problem:
1 Click on the “Finder” icon located in your dock or the desktop of your computer to make “Finder” the active program in the finder menu bar.
2 Hold down the “Option” key on your keyboard while clicking “Go” in the finder menu bar. A dropdown will appear.
3 While still holding down the “Option” key, click on “Library” in the “Go” dropdown.
4 Once in the Library folder click on Application Support > Guild Wars 2
5 Move the entire Guild Wars 2 folder to the trash and then empty the trash.
The next time you launch Guild Wars 2 it will recreate the recently deleted folder.
Please launch Guild Wars 2 and see if you are able to log in and play without issues.
Hope it works for you