I am trying to follow the Kenan Proffitt tutorial on YouTube for two point motion tracking but the Foreground and Background layers are not appearing in the compositor.

When I add the video input node and select the video I get a small square in the node with the video.

When I add the two Render Layer nodes (for my two layers) and select my scene I don't get that small preview square - and there is nothing from these layers in my final render. I also get nothing if I plug the Render Layer node(s) directly into the viewer or composite node.

Picture of nodes without little window - https://www.dropbox.com/s/he43jxs6y465l77/Nodes%20-%20without%20the%20little%20window.PNG?dl=0

Blender file - https://www.dropbox.com/s/qua5ebahutejyvi/Green%20screen%20-%20light%20saber%202.0.blend?dl=0

Thanks in advance for any help you can offer!