As far as I can tell, Llibrary does not work at all with Vivecraft (Minecraft VR). Since Llibrary is an awesome graphics-utility mod that is used by various other awesome mods, it would be really great to see Vivecraft support added.

I'll attach a crash report from my friend's test. Since I don't have VR myself (I'm posting this for said friend), it's somewhat difficult to run tests.
crash-2018-12-16_18.05.56-client.txt

Thanks for the report! If the pack is kept the same, but LLibrary is removed, does this crash still occur?

sadly got the same problem, no mowsies mobs or jurrasicraft in vr for a while i guess.