Ok so once i updated the fabric API From 0.29.4 to 0.30.0 my game started crashing on startup, Narrowing it down seems like Optifabric is the issue. I Can Open an issue with optifabric if i need to. I think its on optifabric's end but im opening an issue thread here just to be sure.

Crash log
crash-2021-01-28_10.26.15-client.txt

Mods

tell me if i need anything else thanks.

update your optifabric to 1.9.2

ok that seemed to work thanks for your help