Won't Take Damage java.lang.NoSuchMethodError

For some reason my Minecraft server is not letting me take any type of damage, and not only that, but I've configured the server to make normally crashing entities to dissapear instead, to try and look at what the error might be. For some reason, Entities will become corrupted when trying to hurt me. Here I give you the crash report:

java.lang.NoSuchMethodError: net.minecraft.entity.player.InventoryPlayer.func_70440_f(I)Lnet/minecraft/item/ItemStack;
    at com.lying.variousoddities.utility.bus.VOBusServer.onPlayerBreakArmorEventPre(VOBusServer.java:878)
    at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_728_VOBusServer_onPlayerBreakArmorEventPre_LivingHurtEvent.invoke(.dynamic)
    at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90)
    at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:182)
    at net.minecraftforge.common.ForgeHooks.onLivingHurt(ForgeHooks.java:604)
    at net.minecraft.entity.player.EntityPlayer.func_70665_d(EntityPlayer.java:1120)
    at net.minecraft.entity.EntityLivingBase.func_70097_a(EntityLivingBase.java:926)
    at net.minecraft.entity.player.EntityPlayer.func_70097_a(EntityPlayer.java:1038)
    at net.minecraft.entity.player.EntityPlayerMP.func_70097_a(EntityPlayerMP.java:645)
    at micdoodle8.mods.galacticraft.core.entities.player.GCEntityPlayerMP.func_70097_a(GCEntityPlayerMP.java:68)
    at drzhark.mocreatures.entity.MoCEntityAnimal.func_70652_k(MoCEntityAnimal.java:1123)
    at drzhark.mocreatures.entity.passive.MoCEntitySnake.func_70652_k(MoCEntitySnake.java:460)
    at net.minecraft.entity.ai.EntityAIAttackMelee.func_190102_a(EntityAIAttackMelee.java:178)
    at net.minecraft.entity.ai.EntityAIAttackMelee.func_75246_d(EntityAIAttackMelee.java:167)
    at net.minecraft.entity.ai.EntityAITasks.func_75774_a(SourceFile:129)
    at net.minecraft.entity.EntityLiving.func_70626_be(EntityLiving.java:763)
    at net.minecraft.entity.EntityLivingBase.func_70636_d(EntityLivingBase.java:2359)
    at net.minecraft.entity.EntityLiving.func_70636_d(EntityLiving.java:577)
    at net.minecraft.entity.EntityAgeable.func_70636_d(EntityAgeable.java:178)
    at net.minecraft.entity.passive.EntityAnimal.func_70636_d(SourceFile:43)
    at drzhark.mocreatures.entity.MoCEntityAnimal.func_70636_d(MoCEntityAnimal.java:359)
    at drzhark.mocreatures.entity.MoCEntityTameableAnimal.func_70636_d(MoCEntityTameableAnimal.java:435)
    at drzhark.mocreatures.entity.passive.MoCEntitySnake.func_70636_d(MoCEntitySnake.java:415)
    at net.minecraft.entity.EntityLivingBase.func_70071_h_(EntityLivingBase.java:2179)
    at net.minecraft.entity.EntityLiving.func_70071_h_(EntityLiving.java:295)
    at drzhark.mocreatures.entity.passive.MoCEntitySnake.func_70071_h_(MoCEntitySnake.java:265)
    at net.minecraft.world.World.func_72866_a(World.java:1996)
    at net.minecraft.world.WorldServer.func_72866_a(WorldServer.java:832)
    at net.minecraft.world.World.func_72870_g(World.java:1958)
    at net.minecraft.world.World.func_72939_s(World.java:1762)
    at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:613)
    at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:767)
    at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:397)
    at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:668)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:526)
    at java.lang.Thread.run(Unknown Source)

I can also link the whole log if this doesn't help. Thank you.