Thank you for the tip, I didn't thought to look at what you post before Old_Grey , I manage to put copper1 and 0 into the same layer, I have no more error when loading it into fritzing and in the view panel when i show Top or bottom layer I got 2 differentlayers so that's ok.
The last thing is that I have a red rectangle in the middle of my pcb drawing and I don't really know where it come from if you know something about it let me know