[10:32:18 ERROR]: Command exception: /class choose CLASS MAGE

[10:32:18 INFO]: MyDevZone issued server command: /class choose CLASS MAGE
[10:32:18 INFO]: [MythicMobs] initializing archetypes
[10:32:18 INFO]: [MythicMobs] Archetype of CLASS found MAGE
[10:32:18 ERROR]: Command exception: /class choose CLASS MAGE
org.bukkit.command.CommandException: Unhandled exception executing command 'class' in plugin MythicRPG v0.0.1-SNAPSHOT
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:47) ~[paper-api-1.21-R0.1-SNAPSHOT.jar:?]
        at io.papermc.paper.command.brigadier.bukkit.BukkitCommandNode$BukkitBrigCommand.run(BukkitCommandNode.java:91) ~[paper-1.21.jar:1.21-127-4e6a2a1]
        at com.mojang.brigadier.context.ContextChain.runExecutable(ContextChain.java:73) ~[brigadier-1.2.9.jar:?]
        at net.minecraft.commands.execution.tasks.ExecuteCommand.execute(ExecuteCommand.java:31) ~[paper-1.21.jar:1.21-127-4e6a2a1]
        at net.minecraft.commands.execution.tasks.ExecuteCommand.execute(ExecuteCommand.java:19) ~[paper-1.21.jar:1.21-127-4e6a2a1]
        at net.minecraft.commands.execution.UnboundEntryAction.lambda$bind$0(UnboundEntryAction.java:8) ~[paper-1.21.jar:1.21-127-4e6a2a1]
        at net.minecraft.commands.execution.CommandQueueEntry.execute(CommandQueueEntry.java:5) ~[paper-1.21.jar:1.21-127-4e6a2a1]
        at net.minecraft.commands.execution.ExecutionContext.runCommandQueue(ExecutionContext.java:103) ~[paper-1.21.jar:1.21-127-4e6a2a1]
        at net.minecraft.commands.Commands.executeCommandInContext(Commands.java:443) ~[paper-1.21.jar:1.21-127-4e6a2a1]
        at net.minecraft.commands.Commands.performCommand(Commands.java:350) ~[paper-1.21.jar:1.21-127-4e6a2a1]
        at net.minecraft.commands.Commands.performCommand(Commands.java:337) ~[paper-1.21.jar:1.21-127-4e6a2a1]
        at net.minecraft.commands.Commands.performCommand(Commands.java:332) ~[paper-1.21.jar:1.21-127-4e6a2a1]
        at net.minecraft.server.network.ServerGamePacketListenerImpl.performUnsignedChatCommand(ServerGamePacketListenerImpl.java:2147) ~[paper-1.21.jar:1.21-127-4e6a2a1]
        at net.minecraft.server.network.ServerGamePacketListenerImpl.lambda$handleChatCommand$11(ServerGamePacketListenerImpl.java:2121) ~[paper-1.21.jar:1.21-127-4e6a2a1]
        at net.minecraft.server.TickTask.run(TickTask.java:18) ~[paper-1.21.jar:1.21-127-4e6a2a1]
        at net.minecraft.util.thread.BlockableEventLoop.doRunTask(BlockableEventLoop.java:151) ~[paper-1.21.jar:1.21-127-4e6a2a1]
        at net.minecraft.util.thread.ReentrantBlockableEventLoop.doRunTask(ReentrantBlockableEventLoop.java:24) ~[paper-1.21.jar:1.21-127-4e6a2a1]
        at net.minecraft.server.MinecraftServer.doRunTask(MinecraftServer.java:1537) ~[paper-1.21.jar:1.21-127-4e6a2a1]
        at net.minecraft.server.MinecraftServer.doRunTask(MinecraftServer.java:201) ~[paper-1.21.jar:1.21-127-4e6a2a1]
        at net.minecraft.util.thread.BlockableEventLoop.pollTask(BlockableEventLoop.java:125) ~[paper-1.21.jar:1.21-127-4e6a2a1]
        at net.minecraft.server.MinecraftServer.pollTaskInternal(MinecraftServer.java:1514) ~[paper-1.21.jar:1.21-127-4e6a2a1]
        at net.minecraft.server.MinecraftServer.pollTask(MinecraftServer.java:1507) ~[paper-1.21.jar:1.21-127-4e6a2a1]
        at net.minecraft.util.thread.BlockableEventLoop.managedBlock(BlockableEventLoop.java:135) ~[paper-1.21.jar:1.21-127-4e6a2a1]
        at net.minecraft.server.MinecraftServer.managedBlock(MinecraftServer.java:1466) ~[paper-1.21.jar:1.21-127-4e6a2a1]
        at net.minecraft.server.MinecraftServer.waitUntilNextTick(MinecraftServer.java:1473) ~[paper-1.21.jar:1.21-127-4e6a2a1]
        at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1318) ~[paper-1.21.jar:1.21-127-4e6a2a1]
        at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:330) ~[paper-1.21.jar:1.21-127-4e6a2a1]
        at java.base/java.lang.Thread.run(Thread.java:1583) ~[?:?]
Caused by: java.lang.NullPointerException

Paper version: [10:46:23 INFO]: This server is running Paper version 1.21-127-master@4e6a2a1 (2024-08-07T12:50:10Z) (Implementing API version 1.21-R0.1-SNAPSHOT) You are 3 version(s) behind Download the new version at: https://papermc.io/downloads/paper Previous version: 1.21-126-7e44684 (MC: 1.21)

Config:

MAGE:
  Display: 'Mage'
  MaxLevel: 1
  Group: CLASS
  Leveling:
    MinLevel: 1
    MaxLevel: 100
    ExperienceCurve: CLASS
    ExperienceSource: CLASS
  BaseStats:
  - HEALTH '20 + 5L'
  InitSkills: []
  QuitSkills: []