This list of mods conflicts somehow causing a crash when a player would kill a brown cow (but not a sheep?): DisableFogSpider, BetterDigging, FishingIgnoresRange, TreasureChestClaim, Harvesting QL limit, Movetocenter, ServerPlayerCounter, Dupe Auth Fix (Servertweaks), Timerfix, Upkeepcosts, HitchingPost, Temperature Survival.
I think it might be hitching post mod, I am still testing. I initially thought it might be the server tweaks/player count mods conflicting until I saw the error upon server start. Was something about missing item for hitched brown cow (thus hitching post mod, which isn't ago mod loader approved so go figure?). When a player would kill a brown cow, the whole server would crash out. Anyone mind diving in and possibly giving a more technical explanation?