Why when I render my 200 frame animation everything is the world color and not the animation? Please Help
Why when I render my 200 frame animation everything is the world color and not the animation?  I have fully created the models and environment and when I run the animation in the UI under material it works fine,  when I try to animate the animation is just gives me grey frames.
I cannot figure out why it wont render the actual animation.

http://youtu.be/A5J8y4uCtsU
be sure that all  layers that contains your objects are selected in the render_layer tab"