Internal Error on MC Paper Server 1.16.5 about perworldplugins

[TonimatasDEV]

Dear TonimatasDEV!

Today I found a problem I couldn't deal with. In the config file I set the plugins I want to limit on certain worlds. After I save the file and try to reload it It wrote that some internal error occured.

When I go into the console I got this warning.

[22:40:14] [Server thread/ERROR]: null org.bukkit.command.CommandException: Unhandled exception executing command 'pwp' in plugin PerWorldPlugins v1.3.0 at org.bukkit.command.PluginCommand.execute(PluginCommand.java:47) ~[patched_1.16.5.jar:git-Paper-428] at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:159) ~[patched_1.16.5.jar:git-Paper-428] at org.bukkit.craftbukkit.v1_16_R3.CraftServer.dispatchCommand(CraftServer.java:807) ~[patched_1.16.5.jar:git-Paper-428] at net.minecraft.server.v1_16_R3.PlayerConnection.handleCommand(PlayerConnection.java:2021) ~[patched_1.16.5.jar:git-Paper-428] at net.minecraft.server.v1_16_R3.PlayerConnection.c(PlayerConnection.java:1832) ~[patched_1.16.5.jar:git-Paper-428] at net.minecraft.server.v1_16_R3.PlayerConnection.a(PlayerConnection.java:1785) ~[patched_1.16.5.jar:git-Paper-428] at net.minecraft.server.v1_16_R3.PacketPlayInChat.a(PacketPlayInChat.java:47) ~[patched_1.16.5.jar:git-Paper-428] at net.minecraft.server.v1_16_R3.PacketPlayInChat.a(PacketPlayInChat.java:5) ~[patched_1.16.5.jar:git-Paper-428] at net.minecraft.server.v1_16_R3.PlayerConnectionUtils.lambda$ensureMainThread$1(PlayerConnectionUtils.java:23) ~[patched_1.16.5.jar:git-Paper-428] at net.minecraft.server.v1_16_R3.TickTask.run(SourceFile:18) ~[patched_1.16.5.jar:git-Paper-428] at net.minecraft.server.v1_16_R3.IAsyncTaskHandler.executeTask(IAsyncTaskHandler.java:136) ~[patched_1.16.5.jar:git-Paper-428] at net.minecraft.server.v1_16_R3.IAsyncTaskHandlerReentrant.executeTask(SourceFile:23) ~[patched_1.16.5.jar:git-Paper-428] at net.minecraft.server.v1_16_R3.IAsyncTaskHandler.executeNext(IAsyncTaskHandler.java:109) ~[patched_1.16.5.jar:git-Paper-428] at net.minecraft.server.v1_16_R3.MinecraftServer.bb(MinecraftServer.java:1132) ~[patched_1.16.5.jar:git-Paper-428] at net.minecraft.server.v1_16_R3.MinecraftServer.executeNext(MinecraftServer.java:1125) ~[patched_1.16.5.jar:git-Paper-428] at net.minecraft.server.v1_16_R3.IAsyncTaskHandler.awaitTasks(IAsyncTaskHandler.java:119) ~[patched_1.16.5.jar:git-Paper-428] at net.minecraft.server.v1_16_R3.MinecraftServer.sleepForTick(MinecraftServer.java:1086) ~[patched_1.16.5.jar:git-Paper-428] at net.minecraft.server.v1_16_R3.MinecraftServer.w(MinecraftServer.java:1000) ~[patched_1.16.5.jar:git-Paper-428] at net.minecraft.server.v1_16_R3.MinecraftServer.lambda$a$0(MinecraftServer.java:173) ~[patched_1.16.5.jar:git-Paper-428] at java.lang.Thread.run(Thread.java:834) [?:?] Caused by: java.lang.NoSuchFieldError: LEVEL_UP at me.incomprehendable.dev.pwp.PWPCommandExecutor.onCommand(PWPCommandExecutor.java:22) ~[?:?] at org.bukkit.command.PluginCommand.execute(PluginCommand.java:45) ~[patched_1.16.5.jar:git-Paper-428] ... 19 more

And after I restart the server the original file is being set back.

What can I do now to fix this problem?

Sorry, this is not my plugin, my plugin doesn't have this commands and this version.
For download my plugin go: https://modrinth.com/plugin/perworldplugins/version/1.0.1.9