Error ./mine tool

[11:13:17 ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing 'mine tool' in me.hapily.plugins.mines.mines.CMDMine(mine)
at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:151) ~[spigot.jar:git-iSpigot-PaperEdition]
at org.bukkit.craftbukkit.v1_8_R3.CraftServer.dispatchCommand(SourceFile:746) ~[spigot.jar:git-iSpigot-PaperEdition]
at net.minecraft.server.v1_8_R3.PlayerConnection.handleCommand(SourceFile:1383) ~[spigot.jar:git-iSpigot-PaperEdition]
at net.minecraft.server.v1_8_R3.PlayerConnection.a(SourceFile:1195) ~[spigot.jar:git-iSpigot-PaperEdition]
at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(SourceFile:59) ~[spigot.jar:git-iSpigot-PaperEdition]
at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(SourceFile:15) ~[spigot.jar:git-iSpigot-PaperEdition]
at net.minecraft.server.v1_8_R3.PlayerConnectionUtils.lambda$ensureMainThread$0(SourceFile:52) ~[spigot.jar:git-iSpigot-PaperEdition]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:539) ~[?:?]
at java.util.concurrent.FutureTask.run(FutureTask.java:264) ~[?:?]
at org.imanity.imanityspigot.final .cI.run(Unknown Source) ~[spigot.jar:git-iSpigot-PaperEdition]
at org.imanity.imanityspigot.final .cG.executeTask(Unknown Source) ~[spigot.jar:git-iSpigot-PaperEdition]
at org.imanity.imanityspigot.final .cH.executeTask(Unknown Source) ~[spigot.jar:git-iSpigot-PaperEdition]
at org.imanity.imanityspigot.final .cG.executeNext(Unknown Source) ~[spigot.jar:git-iSpigot-PaperEdition]
at net.minecraft.server.v1_8_R3.MinecraftServer.executeNext(SourceFile:1928) ~[spigot.jar:git-iSpigot-PaperEdition]
at org.imanity.imanityspigot.final .cG.awaitTasks(Unknown Source) ~[spigot.jar:git-iSpigot-PaperEdition]
at net.minecraft.server.v1_8_R3.MinecraftServer.sleepForTick(SourceFile:1901) ~[spigot.jar:git-iSpigot-PaperEdition]
at net.minecraft.server.v1_8_R3.MinecraftServer.run(SourceFile:838) ~[spigot.jar:git-iSpigot-PaperEdition]
at java.lang.Thread.run(Thread.java:833) ~[?:?]
Caused by: java.lang.NoSuchFieldError: GOLDEN_PICKAXE
at me.hapily.plugins.mines.mines.CMDMine.execute(CMDMine.java:88) ~[?:?]
at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:144) ~[spigot.jar:git-iSpigot-PaperEdition]
... 17 more

Hello there author! Why did you not code it to work on 1.15? I'm trying to use it and it errors the console. Pls help.

So far it's lightweight with 0 errors on 1.18.2. If you want something simple this is a great plugin!