(PC, custom modpack including Lycanites Mobs 1.16.5-2.3.3.6) crashing a few minutes after loading a new world

[Lifeline]

java.lang.IllegalArgumentException: Can't find attribute minecraft:generic.attack_knockback

having the same problem as this one: https://forums.minecraftforge.net/topic/151258-some-kind-of-issue-with-lycanites-mobs-and-the-knockback-attribute/

also my report on Lycanites Issue page(crash log included): https://gitlab.com/Lycanite/LycanitesMobs/-/issues/951

[TileEntity]

An Ostimien mob from it is invalid at pos 170,66,-143

Check the config (lycanitesmobs-spawning.cfg) and temporarily disable Ostimien