Is possible that the skin is not in the mod and was being downloaded from Minecraft skins server? If so the skin could be no more present on the Mojang servers, causing the crash:
-- Head --Thread: Server threadStacktrace: at java.util.ArrayList.rangeCheck(Unknown Source) at java.util.ArrayList.get(Unknown Source) at tamaized.voidcraft.common.handlers.SkinHandler.getUUID(SkinHandler.java:34) at tamaized.voidcraft.common.entity.boss.herobrine.ai.EntityAIHerobrinePhase3.getRandomUnusedUUID(EntityAIHerobrinePhase3.java:185) at
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Is there any possibility of this mod being allowed in modpacks? I'd love to put it in my small one that me and my friends play.
Also, I'm curious why it's even not allowed in the first place, especially since this mod is completely abandoned?