Shadow screen after hitting the play game

Hello ,
I have a problem , that after I play the game , a grey screen appears. It happend after adding the collision to my map. Before it it was working perfecty. I've been following the tutorial:

Please help me ;(

 

Is there a camera in your scene? I don't see one, you might have accidentally deleted it (although it usually renders a black screen telling you that there are no active cameras).

Edit: Nevermind, for some reason I didn't see the other screenshots. If you can't find a solution try posting the project, people could download it and see if there is anything wrong.