Cannot create addon. "Not allowed by whitelist" error

So I am trying to make a completely simple addon. Whenever I run the command “/media/…/GarrysMod/bin/gmad_linux ttt_cloak” it throws me an error:



Garry's Mod Addon Creator 1.1
Looking in folder "ttt_cloak/"
	ttt_cloak/addon.json
		[Not allowed by whitelist]
File list verification failed


If I remove the addon.json, then obviously I get an error that it doesn’t exist:



Garry's Mod Addon Creator 1.1
Looking in folder "ttt_cloak/"
ttt_cloak/addon.json error: Couldn't find file


So… what should I do? Thanks in advance!

Btw, here is my addon.json:



{"title": "TTT More Visible Cloaking", "type": "weapon"}


and here is the entire structure of the plugin:

https://i.vil.so/AIc868F.png

GMad on linux is broken at the moment.

Oh, well, here we go then…

https://i.vil.so/D4iP1f7.png

xD Okay then.
Did you buy the key especially for this?

I think Windows 10 is free at the moment if I’m not mistaken.

Oh. The developer version. Or whatever.