Short description:
The subquest "Masons" which is part of the main quest "Stone production" doesn't unlock while all prerequisites seem to be met.
Screenshot:
Possible cause:
Not completing the subquest "The Geologist" before reaching level 16
Prevention:
Complete the subquest "The Geologist" before reaching level 16
Workaround:
None
Related:
- Quest doesn't unlock: "Ranged Units - Longbows"
- Quest doesn't unlock: "The battle - Join the army"
- Quest doesn't unlock: "Free the homezone - More sectors"
Original thread(s): 1