Texture baking SOS


I am trying to bake my materials that contains textures to one baked texture, following BlenderGuru tutorial, but I’ve got quite serious problem, the baked texture is everytime completly black but sometimes some parts are baked well. I need some advice what could be wrong. It’s unwrapped and I’ve got selected the right texture in node editor.

Thank you very much.

Please supply a link to your blend file so other users can see what you see