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Any item at folder Mythicmob/items is not working using /mm item give command will having error:

Minecraft version: paper-145 1.16.2 plugin version: 4.9.1

.... [13:55:38 ERROR]: null org.bukkit.command.CommandException: Unhandled exception executing command 'mm' in plugin MythicMobs v4.9.1-3294 at org.bukkit.command.PluginCommand.execute(PluginCommand.java:47) ~[patched_1.16.2.jar:git-Paper-145] at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:159) ~[patched_1.16.2.jar:git-Paper-145] at org.bukkit.craftbukkit.v1_16_R2.CraftServer.dispatchCommand(CraftServer.java:800) ~[patched_1.16.2.jar:git-Paper-145] at net.minecraft.server.v1_16_R2.PlayerConnection.handleCommand(PlayerConnection.java:1907) ~[patched_1.16.2.jar:git-Paper-145] at net.minecraft.server.v1_16_R2.PlayerConnection.a(PlayerConnection.java:1718) ~[patched_1.16.2.jar:git-Paper-145] at net.minecraft.server.v1_16_R2.PacketPlayInChat.a(PacketPlayInChat.java:47) ~[patched_1.16.2.jar:git-Paper-145] at net.minecraft.server.v1_16_R2.PacketPlayInChat.a(PacketPlayInChat.java:5) ~[patched_1.16.2.jar:git-Paper-145] at net.minecraft.server.v1_16_R2.PlayerConnectionUtils.lambda$ensureMainThread$1(PlayerConnectionUtils.java:23) ~[patched_1.16.2.jar:git-Paper-145] at net.minecraft.server.v1_16_R2.TickTask.run(SourceFile:18) ~[patched_1.16.2.jar:git-Paper-145] at net.minecraft.server.v1_16_R2.IAsyncTaskHandler.executeTask(IAsyncTaskHandler.java:136) ~[patched_1.16.2.jar:git-Paper-145] at net.minecraft.server.v1_16_R2.IAsyncTaskHandlerReentrant.executeTask(SourceFile:23) ~[patched_1.16.2.jar:git-Paper-145] at net.minecraft.server.v1_16_R2.IAsyncTaskHandler.executeNext(IAsyncTaskHandler.java:109) ~[patched_1.16.2.jar:git-Paper-145] at net.minecraft.server.v1_16_R2.MinecraftServer.ba(MinecraftServer.java:1135) ~[patched_1.16.2.jar:git-Paper-145] at net.minecraft.server.v1_16_R2.MinecraftServer.executeNext(MinecraftServer.java:1128) ~[patched_1.16.2.jar:git-Paper-145] at net.minecraft.server.v1_16_R2.IAsyncTaskHandler.executeAll(IAsyncTaskHandler.java:95) ~[patched_1.16.2.jar:git-Paper-145] at net.minecraft.server.v1_16_R2.MinecraftServer.a(MinecraftServer.java:1264) ~[patched_1.16.2.jar:git-Paper-145] at net.minecraft.server.v1_16_R2.MinecraftServer.w(MinecraftServer.java:999) ~[patched_1.16.2.jar:git-Paper-145] at net.minecraft.server.v1_16_R2.MinecraftServer.lambda$a$0(MinecraftServer.java:177) ~[patched_1.16.2.jar:git-Paper-145] at java.lang.Thread.run(Thread.java:748) [?:1.8.0_262] Caused by: java.lang.NumberFormatException: For input string: "waiching514" at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65) ~[?:1.8.0_262] at java.lang.Integer.parseInt(Integer.java:580) ~[?:1.8.0_262] at java.lang.Integer.valueOf(Integer.java:766) ~[?:1.8.0_262] at io.lumine.xikage.mythicmobs.commands.items.GetCommand.onCommand(GetCommand.java:48) ~[?:?] at io.lumine.xikage.mythicmobs.utils.commands.Command.onCommand(Command.java:68) ~[?:?] at io.lumine.xikage.mythicmobs.utils.commands.Command.onCommand(Command.java:59) ~[?:?] at io.lumine.xikage.mythicmobs.utils.commands.Command.onCommand(Command.java:59) ~[?:?] at org.bukkit.command.PluginCommand.execute(PluginCommand.java:45) ~[patched_1.16.2.jar:git-Paper-145] ... 18 more