So, I did everything from the tutorials right, I also removed doubles and took away all previous textures and materials and did all of the things right. But, how come the Normal map is still grey. If I turn off Select to Active, it becomes blue... I read litterally all of the problems, but never found this one. I also re-sized the meshes and played around with bias but nothing happened.
Link to .blend file The Problem File of DOOOOOOMMMMM!!!!!