Just encountered this issue: users in this reddit thread were having the same problem and found a fix.

Basically the current version of forge that's being provided with the mod, at least when you use prism to download it from curseforge, is currently borked, causing a crash with this error message: "[05:20:20] [main/ERROR] [mixin/]: Mixin config antiqueatlas.mixins.json does not specify "minVersion" property" to get spat out.

The fix is to manually edit the prism instance to the latest forge version which fixed the issue (at least on my machine).

If it's possible to change the default forge version provided with this mod, that would fix the issue. If this isn't something that you directly control and is on curseforge it'd probably be a good idea to add a disclaimer (I'm not familiar enough with mc modding to know what the problem is, sorry :P)

Thanks for all the great work on this mod <3

This is also an issue with the server too btw, I had to install the latest forge version (1.16.5-36.2.39) to get the server to work!

lemme test dat

This should be fixed in #489