Versions

Betweenlands version:TheBetweenlands-3.3.8-universal

Forge version:

forge-1.12.2-14.23.4.2705-universal

Singleplayer or Multiplayer:

Multiplayer dedicated headless server. - Linux. Forge only.

Installed mods:

https://minecraft.curseforge.com/projects/ancient-towncraft

Link to full crash log

Each crash gives a diffeerent error, here they are-

https://paste.fedoraproject.org/paste/UFmQKnwGqk~Dz~a3rp5TMg <-General CMe
https://paste.fedoraproject.org/paste/Ugvux0NJKTR4ACMbugFL8g <- Ancient Warfare CME
https://paste.fedoraproject.org/paste/9pyXQJUxOINLGB4507kJFQ
https://paste.fedoraproject.org/paste/ez9YFUNdvQ08Nd6y29B0zA <- General CME
https://paste.fedoraproject.org/paste/YrMp4c-Qq49MozMjzY5xBA <- Betweenlands CME

Description of the problem

How to reproduce:

1. Download pack
2. Run pack on a Dedicated server with old map.
3. etc...

After updating the pack again, I can no longer reproduce this.