Maintenance for the week of June 23:
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• PC/Mac: NA and EU megaservers for maintenance – June 25, 12:00AM EDT (4:00 UTC) - 6:00PM EDT (22:00 UTC) https://forums.elderscrollsonline.com/en/discussion/679500
If this persists much longer ... well I am not going to pay a sub for a game I cannot play. And, no, I am not going to try hunting down files, deleting them, restoring them, or any of that crap. ZM/B need to fix this ASAP, and I mean NOW.
So you want an immediate fix, knowing that it will not come and refuse to do any of the fixes including the ones that were found or endorsed by ZOS devs... ZOS simply cannot win with people.
Before doing anything, close out of the error and launcher. Then relaunch. This will often solve it. Some people have had to repeat this a couple times. If still not working, try the fix/work a rounds.