[17:29:09] [Server thread/ERROR]: null
 org.bukkit.command.CommandException: Unhandled exception executing command 'rw' in plugin ResourceWorld v1.9.8
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:47) ~[forge:?]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:156) ~[forge:?]
        at org.bukkit.craftbukkit.v1_16_R3.CraftServer.dispatchCommand(CraftServer.java:680) ~[forge:1.16.5-54d7a066]
        at net.minecraft.network.play.ServerPlayNetHandler.func_147361_d(ServerPlayNetHandler.java:1788) ~[?:?]
        at net.minecraft.network.play.ServerPlayNetHandler.func_244548_c(ServerPlayNetHandler.java:1650) ~[?:?]
        at net.minecraft.network.play.ServerPlayNetHandler.func_147354_a(ServerPlayNetHandler.java:1604) ~[?:?]
        at net.minecraft.network.play.client.CChatMessagePacket.func_148833_a(CChatMessagePacket.java:38) ~[?:?]
        at net.minecraft.network.play.client.CChatMessagePacket.func_148833_a(CChatMessagePacket.java:8) ~[?:?]
        at net.minecraft.network.PacketThreadUtil.func_225383_a(PacketThreadUtil.java:22) ~[?:?]
        at net.minecraft.util.concurrent.TickDelayedTask.run(SourceFile:18) ~[?:?]
        at net.minecraft.util.concurrent.ThreadTaskExecutor.func_213166_h(SourceFile:144) ~[?:?]
        at net.minecraft.util.concurrent.RecursiveEventLoop.func_213166_h(SourceFile:23) ~[?:?]
        at net.minecraft.server.MinecraftServer.func_213166_h(MinecraftServer.java:886) ~[?:?]
        at net.minecraft.server.MinecraftServer.func_213166_h(MinecraftServer.java:169) ~[?:?]
        at net.minecraft.util.concurrent.ThreadTaskExecutor.func_213168_p(SourceFile:118) ~[?:?]
        at net.minecraft.server.MinecraftServer.func_213205_aW(MinecraftServer.java:869) ~[?:?]
        at net.minecraft.server.MinecraftServer.func_213168_p(MinecraftServer.java:863) ~[?:?]
        at net.minecraft.util.concurrent.ThreadTaskExecutor.func_213160_bf(SourceFile:103) ~[?:?]
        at net.minecraft.server.MinecraftServer.func_213202_o(MinecraftServer.java:848) ~[?:?]
        at net.minecraft.server.MinecraftServer.func_240802_v_(MinecraftServer.java:781) ~[?:?]
        at net.minecraft.server.MinecraftServer.func_240783_a_(MinecraftServer.java:265) ~[?:?]
        at java.lang.Thread.run(Thread.java:829) [?:?]
Caused by: java.nio.channels.OverlappingFileLockException
        at sun.nio.ch.FileLockTable.checkList(FileLockTable.java:229) ~[?:?]
        at sun.nio.ch.FileLockTable.add(FileLockTable.java:123) ~[?:?]
        at sun.nio.ch.FileChannelImpl.tryLock(FileChannelImpl.java:1154) ~[?:?]
        at java.nio.channels.FileChannel.tryLock(FileChannel.java:1165) ~[?:?]
        at net.minecraft.server.SessionLockManager.func_232998_a_(SourceFile:42) ~[?:?]
        at net.minecraft.world.storage.SaveFormat$LevelSave.<init>(SaveFormat.java:301) ~[?:?]
        at net.minecraft.world.storage.SaveFormat.cBCreateAccess(SaveFormat.java:271) ~[?:?]
        at org.bukkit.craftbukkit.v1_16_R3.CraftServer.createWorld(CraftServer.java:930) ~[forge:1.16.5-54d7a066]
        at org.bukkit.Bukkit.createWorld(Bukkit.java:535) ~[forge:?]
        at org.bukkit.WorldCreator.createWorld(WorldCreator.java:325) ~[forge:?]
        at me.nik.resourceworld.managers.custom.CustomWorld.generate(CustomWorld.java:62) ~[?:?]
        at me.nik.resourceworld.ResourceWorld.onEnable(ResourceWorld.java:161) ~[?:?]
        at me.nik.resourceworld.commands.subcommands.Reload.perform(Reload.java:52) ~[?:?]
        at me.nik.resourceworld.commands.CommandManager.onCommand(CommandManager.java:100) ~[?:?]
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:45) ~[forge:?]
        ... 21 more