Way to 60, Revendreth is unfinished.
One quest in the campaign is broken and marked as "unavailable" and causes follow up errors.
Grail_retail_03.01.2021.zip

Looks like 57131 might be the offender as it is a normal quest but in wholly marked as "not available (pending)"
The errors on accepting or turning in missions aren't logged so i unfortunately have to guess

I think I noticed that a bit ago, and removed the offending E code. I just pushed my latest changes up but have not checked out your zip file yet.

File processed for Grail 114 release.