Unhandled exception executing command 'spawncorpse' in plugin Corpse v1.0.10

[tsukineko0308]

I need some help.
This Plugin's command /spawncorpse didn't work.
I got error.
My server is Paper 1.12.2
Protocolib ver 4.4.0
Pls help ><

[00:50:28 ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'spawncorpse' in plugin Corpse v1.0.10
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[patched_1.12.2.jar:git-Paper-1620]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:152) ~[patched_1.12.2.jar:git-Paper-1620]
        at org.bukkit.craftbukkit.v1_12_R1.CraftServer.dispatchCommand(CraftServer.java:685) ~[patched_1.12.2.jar:git-Paper-1620]
        at net.minecraft.server.v1_12_R1.PlayerConnection.handleCommand(PlayerConnection.java:1492) ~[patched_1.12.2.jar:git-Paper-1620]
        at net.minecraft.server.v1_12_R1.PlayerConnection.a(PlayerConnection.java:1297) ~[patched_1.12.2.jar:git-Paper-1620]
        at net.minecraft.server.v1_12_R1.PacketPlayInChat.a(PacketPlayInChat.java:45) ~[patched_1.12.2.jar:git-Paper-1620]
        at net.minecraft.server.v1_12_R1.PacketPlayInChat.a(PacketPlayInChat.java:5) ~[patched_1.12.2.jar:git-Paper-1620]
        at net.minecraft.server.v1_12_R1.PlayerConnectionUtils.lambda$ensureMainThread$0(PlayerConnectionUtils.java:14) ~[patched_1.12.2.jar:git-Paper-1620]
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_312]
        at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_312]
        at net.minecraft.server.v1_12_R1.SystemUtils.a(SourceFile:46) ~[patched_1.12.2.jar:git-Paper-1620]
        at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:850) ~[patched_1.12.2.jar:git-Paper-1620]
        at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:423) ~[patched_1.12.2.jar:git-Paper-1620]
        at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:774) ~[patched_1.12.2.jar:git-Paper-1620]
        at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:666) ~[patched_1.12.2.jar:git-Paper-1620]
        at java.lang.Thread.run(Thread.java:748) [?:1.8.0_312]
Caused by: java.lang.IllegalArgumentException: You cannot register objects without a watcher object!
        at com.comphenix.protocol.wrappers.WrappedDataWatcher.setObject(WrappedDataWatcher.java:397) ~[?:?]
        at com.comphenix.protocol.wrappers.WrappedDataWatcher.setObject(WrappedDataWatcher.java:407) ~[?:?]
        at com.github.unldenis.corpse.logic.packet.WrapperEntityMetadata.load(WrapperEntityMetadata.java:69) ~[?:?]
        at java.util.concurrent.CopyOnWriteArrayList.forEach(CopyOnWriteArrayList.java:895) ~[?:1.8.0_312]
        at java.util.concurrent.CopyOnWriteArraySet.forEach(CopyOnWriteArraySet.java:404) ~[?:1.8.0_312]
        at com.github.unldenis.corpse.logic.PacketLoader.load(PacketLoader.java:69) ~[?:?]
        at com.github.unldenis.corpse.logic.Corpse.<init>(Corpse.java:76) ~[?:?]
        at com.github.unldenis.corpse.logic.Corpse.<init>(Corpse.java:92) ~[?:?]
        at com.github.unldenis.corpse.command.SpawnCorpseCommand.onCommand(SpawnCorpseCommand.java:38) ~[?:?]
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[patched_1.12.2.jar:git-Paper-1620]
        ... 15 more