Hey guys,
If you run a Nightmare quest, complete it, then hit Retry or w/e in the results screen to run the quest again, if you are actually out of attempts (3/3) it will try to retry then fail saying you're out of attempts. No problem so far, but then when you hit Exit it says generic server error, so I am stuck at the mission results screen.
I don't know if it took the stamina away for the attempted retry before it failed due to insufficient remaining tries and I don't know if hitting Retry again will take more stamina from me and still fail.