When I try to create a npc server give me this error
What i have to do?
[15:39:45] [Server thread/INFO]: edo_zorz issued server command: /znpcs create 1 player toni
[15:40:09] [Server thread/INFO]: edo_zorz issued server command: /znpcs list
[15:40:36] [Server thread/INFO]: edo_zorz issued server command: /znpcs create 2 player Mario
[15:40:36] [Server thread/WARN]: ak.znetwork.znpcservers.commands.CommandExecuteException
[15:40:36] [Server thread/WARN]: at ak.znetwork.znpcservers.commands.CommandInvoker.execute(CommandInvoker.java:55)
[15:40:36] [Server thread/WARN]: at ak.znetwork.znpcservers.commands.Command.execute(Command.java:135)
[15:40:36] [Server thread/WARN]: at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:149)
[15:40:36] [Server thread/WARN]: at org.bukkit.craftbukkit.v1_18_R1.CraftServer.dispatchCommand(CraftServer.java:821)
[15:40:36] [Server thread/WARN]: at net.minecraft.server.network.PlayerConnection.a(PlayerConnection.java:1939)
[15:40:36] [Server thread/WARN]: at net.minecraft.server.network.PlayerConnection.a(PlayerConnection.java:1778)
[15:40:36] [Server thread/WARN]: at net.minecraft.server.network.PlayerConnection.a(PlayerConnection.java:1759)
[15:40:36] [Server thread/WARN]: at net.minecraft.network.protocol.game.PacketPlayInChat.a(PacketPlayInChat.java:46)
[15:40:36] [Server thread/WARN]: at net.minecraft.network.protocol.game.PacketPlayInChat.a(PacketPlayInChat.java:1)
[15:40:36] [Server thread/WARN]: at net.minecraft.network.protocol.PlayerConnectionUtils.lambda$0(PlayerConnectionUtils.java:30)
[15:40:36] [Server thread/WARN]: at net.minecraft.server.TickTask.run(SourceFile:18)
[15:40:36] [Server thread/WARN]: at net.minecraft.util.thread.IAsyncTaskHandler.c(SourceFile:151)
[15:40:36] [Server thread/WARN]: at net.minecraft.util.thread.IAsyncTaskHandlerReentrant.c(SourceFile:23)
[15:40:36] [Server thread/WARN]: at net.minecraft.server.MinecraftServer.b(MinecraftServer.java:1158)
[15:40:36] [Server thread/WARN]: at net.minecraft.server.MinecraftServer.c(MinecraftServer.java:1)
[15:40:36] [Server thread/WARN]: at net.minecraft.util.thread.IAsyncTaskHandler.y(SourceFile:125)
[15:40:36] [Server thread/WARN]: at net.minecraft.server.MinecraftServer.bf(MinecraftServer.java:1137)
[15:40:36] [Server thread/WARN]: at net.minecraft.server.MinecraftServer.y(MinecraftServer.java:1130)
[15:40:36] [Server thread/WARN]: at net.minecraft.util.thread.IAsyncTaskHandler.c(SourceFile:134)
[15:40:36] [Server thread/WARN]: at net.minecraft.server.MinecraftServer.x(MinecraftServer.java:1114)
[15:40:36] [Server thread/WARN]: at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:1038)
[15:40:36] [Server thread/WARN]: at net.minecraft.server.MinecraftServer.lambda$0(MinecraftServer.java:304)
[15:40:36] [Server thread/WARN]: at java.base/java.lang.Thread.run(Thread.java:833)
[15:40:36] [Server thread/WARN]: Caused by: java.lang.NullPointerException: Cannot invoke "java.lang.reflect.Method.invoke(Object, Object[])" because "ak.znetwork.znpcservers.cache.CacheRegistry.GET_UNIQUE_ID_METHOD" is null
[15:40:36] [Server thread/WARN]: at ak.znetwork.znpcservers.npc.NPC.changeType(NPC.java:272)
[15:40:36] [Server thread/WARN]: at ak.znetwork.znpcservers.npc.NPC.onLoad(NPC.java:154)
[15:40:36] [Server thread/WARN]: at ak.znetwork.znpcservers.npc.NPC.(NPC.java:126)
[15:40:36] [Server thread/WARN]: at ak.znetwork.znpcservers.ServersNPC.createNPC(ServersNPC.java:153)
[15:40:36] [Server thread/WARN]: at ak.znetwork.znpcservers.commands.list.DefaultCommand.createNPC(DefaultCommand.java:101)
[15:40:36] [Server thread/WARN]: at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[15:40:36] [Server thread/WARN]: at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
[15:40:36] [Server thread/WARN]: at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[15:40:36] [Server thread/WARN]: at java.base/java.lang.reflect.Method.invoke(Method.java:568)
[15:40:36] [Server thread/WARN]: at ak.znetwork.znpcservers.commands.CommandInvoker.execute(CommandInvoker.java:53)
[15:40:36] [Server thread/WARN]: ... 22 more
