I am using 1.16.5-forge-36.0.1

software.bernie.geckolib3.geo.exception.GeoModelException: ars_nouveau:geo/spellbook_tier1closed.geo.json: Could not find model.
crash-2021-01-21_12.35.26-client.txt

This has been potentially fixed in the latest version of geckolib, 3.0.1.