Black paint !?

Hi (sorry for my english)

I used a tutorial to paint, it works but when i want add other materials and use them, i have black texture :

The textures works when i delete the part of tuto.
If you can help me (use an easy english pls xD)

Edit : The yellow part is working, the other are black.
What can i do to fix it ?

Your post needs to be edited, its not clear what your problem is.

You most liklely need to setup the materials since empty materials will be black/grey/clear depending on what your creating them from.

My probleme is : i dont know what i have to do to fix this… Why it’s not working when i combine the 2 part ? (Sorry i’m beginner)