error

[09/19/2019 05:25:31 pm]: Caused by: java.lang.NullPointerException[09/19/2019 05:25:31 pm]: at net.Indyuce.mmocore.api.player.profess.PlayerClass.<init>(PlayerClass.java:79) ~[?:?][09/19/2019 05:25:31 pm]: at net.Indyuce.mmocore.manager.ClassManager.reload(ClassManager.java:79) ~[?:?][09/19/2019 05:25:31 pm]: at net.Indyuce.mmocore.MMOCore.reloadPlugin(MMOCore.java:337) ~[?:?][09/19/2019 05:25:31 pm]: at net.Indyuce.mmocore.command.rpg.ReloadCommandMap.execute(ReloadCommandMap.java:23) ~[?:?][09/19/2019 05:25:31 pm]: at net.Indyuce.mmocore.command.api.CommandRoot.executeCommand(CommandRoot.java:17) ~[?:?][09/19/2019 05:25:31 pm]: at net.Indyuce.mmocore.command.MMOCoreCommand.onCommand(MMOCoreCommand.java:42) ~[?:?][09/19/2019 05:25:31 pm]: at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[patched_1.13.2.jar:git-Paper-643]