Grey screen when pressing P in BGE Eveything was working fine while I was in the BGE until for a reason I don't know, the scene doesn't render. Or to be more exact the 1st layer doesn't render.

I tried to copy all layer 1 objects to layer 2 and then when I pressed P, layer 2 stopped rendering as well.

What do I do wrong? I've seen people talking about clipping etc. but I didn't mess with any settings.

Here's the blend file so you can recreate the above.
As @m.ardito correctly noticed I had disabled rendering for the objects, which is clearly visible in the outliner.