MC 1.19.2,
LegacyVault-mc1.19.2-f43.2.0-v1.3.0.jar
Forge: 43.2.21

When I add it to a relatively large modpack I get this crash:

crash-2023-08-02_17.37.42-client.txt

Not sure why it's doing it, but feels related to occulus and the other visual mods I add. cause it's something about a shadowoption config. why it'd be crashing cause of your mod specifically I'm not sure, but it started happening when I updated a bunch of mods and added a handful of small ones like this. but only once yours was turned off, did it come back on. so this is my thought to come ask about it.

Unfortunately this error log has nothing in it about LegacyVault. I suspect that the Iris mod is using mixins and LegacyVault isn't compatible with what the mixins are requiring.

Oh dear... should I post to them and ask if they can pinpoint it for/with you? thats kinda a big thing for a lot of people wanting more frames and stuff...