Помогите Не работает плагин grantgui

пишу команду /grant. пишет внутренняя ошибка

логи:
[13:31:50] [Server thread/INFO]: Polo_43 issued server command: /grant
[13:31:50] [Server thread/ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'grant' in plugin GrantGui v1.3
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:47) ~[craftbukkit.jar:git-Spigot-0287a20-7560f5f]
at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:149) ~[craftbukkit.jar:git-Spigot-0287a20-7560f5f]
at org.bukkit.craftbukkit.v1_16_R1.CraftServer.dispatchCommand(CraftServer.java:755) ~[craftbukkit.jar:git-Spigot-0287a20-7560f5f]
at net.minecraft.server.v1_16_R1.PlayerConnection.handleCommand(PlayerConnection.java:1703) ~[craftbukkit.jar:git-Spigot-0287a20-7560f5f]
at net.minecraft.server.v1_16_R1.PlayerConnection.a(PlayerConnection.java:1546) ~[craftbukkit.jar:git-Spigot-0287a20-7560f5f]
at net.minecraft.server.v1_16_R1.PacketPlayInChat.a(PacketPlayInChat.java:47) ~[craftbukkit.jar:git-Spigot-0287a20-7560f5f]
at net.minecraft.server.v1_16_R1.PacketPlayInChat.a(PacketPlayInChat.java:1) ~[craftbukkit.jar:git-Spigot-0287a20-7560f5f]
at net.minecraft.server.v1_16_R1.PlayerConnectionUtils.lambda$0(PlayerConnectionUtils.java:19) ~[craftbukkit.jar:git-Spigot-0287a20-7560f5f]
at net.minecraft.server.v1_16_R1.TickTask.run(SourceFile:18) ~[craftbukkit.jar:git-Spigot-0287a20-7560f5f]
at net.minecraft.server.v1_16_R1.IAsyncTaskHandler.executeTask(SourceFile:144) ~[craftbukkit.jar:git-Spigot-0287a20-7560f5f]
at net.minecraft.server.v1_16_R1.IAsyncTaskHandlerReentrant.executeTask(SourceFile:23) ~[craftbukkit.jar:git-Spigot-0287a20-7560f5f]
at net.minecraft.server.v1_16_R1.IAsyncTaskHandler.executeNext(SourceFile:118) ~[craftbukkit.jar:git-Spigot-0287a20-7560f5f]
at net.minecraft.server.v1_16_R1.MinecraftServer.aZ(MinecraftServer.java:943) ~[craftbukkit.jar:git-Spigot-0287a20-7560f5f]
at net.minecraft.server.v1_16_R1.MinecraftServer.executeNext(MinecraftServer.java:936) ~[craftbukkit.jar:git-Spigot-0287a20-7560f5f]
at net.minecraft.server.v1_16_R1.IAsyncTaskHandler.awaitTasks(SourceFile:127) ~[craftbukkit.jar:git-Spigot-0287a20-7560f5f]
at net.minecraft.server.v1_16_R1.MinecraftServer.sleepForTick(MinecraftServer.java:920) ~[craftbukkit.jar:git-Spigot-0287a20-7560f5f]
at net.minecraft.server.v1_16_R1.MinecraftServer.v(MinecraftServer.java:852) ~[craftbukkit.jar:git-Spigot-0287a20-7560f5f]
at net.minecraft.server.v1_16_R1.MinecraftServer.lambda$0(MinecraftServer.java:164) ~[craftbukkit.jar:git-Spigot-0287a20-7560f5f]
at java.lang.Thread.run(Thread.java:832) [?:?]
Caused by: java.lang.NoSuchMethodError: 'void org.*********ventory.ItemStack.<init>(int, int)'
at ru.BeTePaH.gtant.onCommand(gtant.java:332) ~[?:?]
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:45) ~[craftbukkit.jar:git-Spigot-0287a20-7560f5f]
... 18 more

 

Плагин ниже версии чем твоё ядро

 

спасибо