Modding mistake

[Tally]

Ok sorry, I have tried something new: I added again a new IWD file ( there is only weapons ) and it worked!!! (zzz_weapons.iwd)
Then I added a new IWD for menus. There is: ui_mp, images and materials. And again this error... Might be the problem on images with the same file? (zzz_menus.iwd)

I tested it the weapons with images and materials -> worked (zzz_weapons.iwd) + (zzz_menus.iwd)
I tested it the weapons with ui_mp -> worked (zzz_weapons.iwd) + (zzz_ menus.iwd)
I tested it the weapons with images, materials, ui_mp -> didn't worked (zzz_weapons.iwd) + (zzz_menus.iwd) + (zzz_menus.iwd)
I tested zzz_menus.iwd (images, materials, ui_mp) it didn't worked. It's 100% cause of the combination of materials, images (materials and images for the weapon images on the weapon menu) and ui_mp (the menus)
The gamestate is not the problem.

zzz_menu.iwd (images,materials and ui_mp) works on local server (on my PC)

Everything you have said in this post tells me it is for sure a gamestate problem. When you run some of your mod, you don't go over 16k of gamestate; However, when you run everything you go over the 16k of gamestate. You really need to tell us what gamestate you get when you run everything. You can find it in your console log file if you run developer_script set to 1. Just search for the word "gamestate" - it will say "sending X bytes of gamestate to client [yourname]. Then, google the amount of bytes you get and convert it to kilobytes. Post the result here.

NB: if your mod is 15.789 kilobytes of gamestate on a stock map, when you run a custom map, the gamestate will be significantly increased, because custom maps are always more gamestate than stock maps. And that gamestate is added to your mod's gamstate:

Example: when I run my mod on mp_carentan, it returns a gamestate of 15.679k; when I run it on mp_brunville, it returns a gamestate of 19.876k. I run COD2 1.3. If it had been 1.0 or 1.2, the game would have crashed with an exceeded gamestate error when running mp_brunville.