Помогите Seller помощ в настройке

такая проблема у меня стоит npc с торговлей когда по нему нажимаешь пишет
An internal error occurred while attempting to perform this command
в консоле в это время вот что

[17:07:30 INFO]: DmitriyZXX issued server command: /seller
[17:07:30 ERROR]: null
org.bukkit.command.CommandException: Cannot execute command 'seller' in plugin uSeller v1.0.0 - plugin is disabled.
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:36) ~[patched_1.12.2.jar:git-Paper-1618]
at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:152) ~[patched_1.12.2.jar:git-Paper-1618]
at org.bukkit.craftbukkit.v1_12_R1.CraftServer.dispatchCommand(CraftServer.java:685) ~[patched_1.12.2.jar:git-Paper-1618]
at net.minecraft.server.v1_12_R1.PlayerConnection.handleCommand(PlayerConnection.java:1492) ~[?:git-Paper-1618]
at net.minecraft.server.v1_12_R1.PlayerConnection.chat(PlayerConnection.java:1401) ~[?:git-Paper-1618]
at org.bukkit.craftbukkit.v1_12_R1.entity.CraftPlayer.chat(CraftPlayer.java:352) ~[patched_1.12.2.jar:git-Paper-1618]
at me.messageofdeath.commandnpc.Listeners.NPCListener.onClick(NPCListener.java:152) ~[?:?]
at me.messageofdeath.commandnpc.Listeners.NPCListener.onRight(NPCListener.java:56) ~[?:?]
at com.destroystokyo.paper.event.executor.asm.generated.GeneratedEventExecutor605.execute(Unknown Source) ~[?:?]
at org.bukkit.plugin.EventExecutor$2.execute(EventExecutor.java:70) ~[patched_1.12.2.jar:git-Paper-1618]
at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:78) ~[patched_1.12.2.jar:git-Paper-1618]
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[patched_1.12.2.jar:git-Paper-1618]
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:513) ~[patched_1.12.2.jar:git-Paper-1618]
at net.citizensnpcs.EventListen.onPlayerInteractEntity(EventListen.java:431) ~[?:?]
at com.destroystokyo.paper.event.executor.asm.generated.GeneratedEventExecutor432.execute(Unknown Source) ~[?:?]
at org.bukkit.plugin.EventExecutor$2.execute(EventExecutor.java:70) ~[patched_1.12.2.jar:git-Paper-1618]
at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:78) ~[patched_1.12.2.jar:git-Paper-1618]
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[patched_1.12.2.jar:git-Paper-1618]
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:513) ~[patched_1.12.2.jar:git-Paper-1618]
at net.minecraft.server.v1_12_R1.PlayerConnection.a(PlayerConnection.java:1682) ~[?:git-Paper-1618]
at net.minecraft.server.v1_12_R1.PacketPlayInUseEntity.a(PacketPlayInUseEntity.java:49) ~[patched_1.12.2.jar:git-Paper-1618]
at net.minecraft.server.v1_12_R1.PacketPlayInUseEntity.a(PacketPlayInUseEntity.java:6) ~[patched_1.12.2.jar:git-Paper-1618]
at net.minecraft.server.v1_12_R1.PlayerConnectionUtils.lambda$ensureMainThread$0(PlayerConnectionUtils.java:14) ~[patched_1.12.2.jar:git-Paper-1618]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_282]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_282]
at net.minecraft.server.v1_12_R1.SystemUtils.a(SourceFile:46) ~[patched_1.12.2.jar:git-Paper-1618]
at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:850) ~[patched_1.12.2.jar:git-Paper-1618]
at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:423) ~[patched_1.12.2.jar:git-Paper-1618]
at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:774) ~[patched_1.12.2.jar:git-Paper-1618]
at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:666) ~[patched_1.12.2.jar:git-Paper-1618]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_282]

ПОМОГИТЕ ПОЖАЛУЙСТА !