After Effects Help! Creating a Shadow Catcher creates a black square

I have restored the settings and I am still having issues. Im new to After effects, im reading a book following tutorials and ran into an issue its not acknowledging.

I am told to Create a Shadow Catcher and Light under an area of text thats on top of a video later thats been tracked. When I create the Shadow Catcher and Light , the Shadow Catcher appears as a Black square. I believe its suppose to be transparent? How do I fix this??