[Not allowed by whitelist]

I been trying to upload a model into gmod but been getting this erorr. [Not allowed by whitelist]
So what I’m going to do is go over anything I did so maybe someone can help.

So I made a folder in my Computer C drive and name it gmodupload
in that folder i got two thing a folder name model and a text file.
the text file is name addon.json
and in the file is this.

{
“title” : “Unknown Box”,
“type” : “model”,
“tags” : [ “fun”, “realism” ],
“ignore” : [ “.psd", ".vcproj”, “.svn” ]
}

ok I also have is a jpg 512x512 image in that folder also name icon but i move it out like the guide say to do.

so ok now let go into the model folder.

in there I got two thing one is my model.

unknownbox.obj

and the other thing is my texture

unknownboxtex.jpg it 256x256

so that all my file and stuff, when I was done making all that
I Open cmd as administer and then put cd C:\Program Files (x86)\Steam\SteamApps\common\GarrysMod\bin
and then gmad.exe create -folder “C:\gmodupload” -out “C:\gmodupload he Addon”
Then this is were I’m getting that error

I’m not sure why it not working so plz help.

also by the way Steam is up in the background.

also here is the guide i was following

Models need to be in the .mdl format and compiled with studiomdl. Secondly, they need to be in the “models” folder. Textures must be in the vmf and vmt format, not .jpg. You should really look up some guides on modelling for Source before trying to upload an addon.

I will thank for your help.