I have a problem with AO baking

Hello Blender forum! I’m posting this thread just for one reason only.
I have a problem with texture baking

Everytime I press the bake button, it gives me a ‘No objects or images found to bake to’ error

however, I have UV unwrapped and assigned a texture

There are no reasons for this error to occur because it worked fine 2 hours ago

This is the link to my .blend so you guys can help me out
https://drive.google.com/file/d/0ByegAi8NUehecXVLYWNEMksxV3c/view?usp=sharing
I really hope I could find a way to fix this bug

This is not a bug, it’s user error

You have turned off renderability for the object you are trying to bake from