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I tried to paint but my cube is fully purple no matter what color I choose.
What should I doo to fix this ?
You need to switch to Look Dev mode in your 3D viewport.
It’s the third icon.
You’re now in Solid mode, where textures don’t show.
The purple color will only show in Solid mode, not in render.
Hope this helps.
Maybe haven't applied any texture to your model... Purple skin usually mean no texture, so you can't paint over it... but you can apply material on it... and for that to show you will need to go to the Dev or Render tab
Required, but never shown