Make sure you have the correct versions of the mods i listed, and don't have multiple versions of the same mod in the mods folder


EMF 2.1.3
https://modrinth.com/mod/entity-model-features/version/hX4kT2fu
ETF 6.1.3
https://modrinth.com/mod/entitytexturefeatures/version/O3jDICoH
Cit 
https://modrinth.com/mod/cit-resewn/version/1.2.2+1.21



Both EMF and ETF are included in the optimization modpack 'Fabulously Optimized' 
https://modrinth.com/modpack/fabulously-optimized

Also available through MultiMC
https://multimc.org/

