[14:06:00 WARN]: java.lang.NoSuchMethodException: me.yakovliam.pets.pet.v1_12.pets.flying.bat.PetEntityBat.<init>(net.minecraft.server.v1_12_R1.World)
[14:06:00 WARN]:        at java.lang.Class.getConstructor0(Class.java:3082)
[14:06:00 WARN]:        at java.lang.Class.getConstructor(Class.java:1825)
[14:06:00 WARN]:        at net.minecraft.server.v1_12_R1.EntityTypes.a(EntityTypes.java:60)
[14:06:00 WARN]:        at net.minecraft.server.v1_12_R1.EntityTypes.a(EntityTypes.java:70)
[14:06:00 WARN]:        at net.minecraft.server.v1_12_R1.ItemMonsterEgg.spawnCreature(ItemMonsterEgg.java:171)
[14:06:00 WARN]:        at net.minecraft.server.v1_12_R1.ItemMonsterEgg.a(ItemMonsterEgg.java:162)
[14:06:00 WARN]:        at net.minecraft.server.v1_12_R1.ItemMonsterEgg.a(ItemMonsterEgg.java:55)
[14:06:00 WARN]:        at net.minecraft.server.v1_12_R1.ItemStack.placeItem(ItemStack.java:191)
[14:06:00 WARN]:        at net.minecraft.server.v1_12_R1.PlayerInteractManager.a(PlayerInteractManager.java:551)
[14:06:00 WARN]:        at net.minecraft.server.v1_12_R1.PlayerConnection.a(PlayerConnection.java:1011)
[14:06:00 WARN]:        at net.minecraft.server.v1_12_R1.PacketPlayInUseItem.a(PacketPlayInUseItem.java:37)
[14:06:00 WARN]:        at net.minecraft.server.v1_12_R1.PacketPlayInUseItem.a(PacketPlayInUseItem.java:5)
[14:06:00 WARN]:        at net.minecraft.server.v1_12_R1.PlayerConnectionUtils.lambda$ensureMainThread$0(PlayerConnectionUtils.java:14)
[14:06:00 WARN]:        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
[14:06:00 WARN]:        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
[14:06:00 WARN]:        at net.minecraft.server.v1_12_R1.SystemUtils.a(SourceFile:46)
[14:06:00 WARN]:        at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:850)
[14:06:00 WARN]:        at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:423)
[14:06:00 WARN]:        at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:774)
[14:06:00 WARN]:        at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:666)
[14:06:00 WARN]:        at java.lang.Thread.run(Thread.java:748)