The server crashes when starting up on the server.

Quark Version: 1.3-107
AutoRegLib: 1.3-13
Forge: 1.12.1-14.22.0.2474

Crash: https://gist.github.com/DaggerTM/d8637e01e785e1fa489731b5fa4b1101

Update to 108.

108 doesn't appear to show in Twitch Deaktop App

That's on their end. You can get it (or 109 now, which is more recent) on the site and drag it into the mods folder.

https://minecraft.curseforge.com/projects/quark/files