When i open minecraft with this mod on 1.16.5 i get an error message.
The error message:
Zombie Awearness has class loading errors
java.lang.NoClassDEfFoundError: com/corosus/modconfig/IConfigCategory

I hope i can get help with this issue as i really want to play with this mod.

happens the same with me, have you find any solution? I saw that happens some times when you run old mods in newer versions, so I think the mod is bad ported from 1.12 or something to 1.16.5

Install coroutil.