When trying to load Requiem 1.2.2 on fabric 0.10.2+build.210 with fabric api 0.25.0 build 415 I got this crash:
crash-2020-11-09_10.31.20-client.txt

Not sure what's happening, or if I forgot to do something simple like not include a dependency, but nothing about that was mentioned

Assuming fixed with latest Fabric API

I believe this is because of an old version of Fabric API. Could you try with the latest one ?