You have duplicate copies of some plugins, or just (1) in the filenames that need to be removed for some.
MOTD is outdated and would need to be...
Sounds like you didn't have Oxide installed then before after updating Hurtworld. Oxide is a mod, so it needs to be installed after each game...
Browse to the oxide/logs folder on your server, then open the latest log file in there and review it with an editor such as Notepad or Notepad++.
Check your oxide/logs for errors.
That means you do not have CSharpCompiler.exe in your server's root for Oxide, which is generally downloaded automatically. If the file isn't...
It isn't related to any plugins or commands, and would only show once on server startup if you have RCON enabled but no password is set.
Oxide build 2.0.3162 - main download / mirror
[Hurtworld] Patched for version 0.3.8.4 update
Do you have the hide permission assigned for admins to be hidden?
I'd suggest checking with your host, as Oxide does not delete your plugins.
That is part of a permission, not a command. ;)
It does use or rely on any fuel at all.
Looks like you're trying to use string.Format with a null or empty variable.
Sounds like you're using an outdated Oxide build then in the case.
You aren't checking if args actually exists, so it's likely from using the command with no arguments.
According to the hook, you're trying to call an argument or something in an array that doesn't exist.