I am altering a sign in my shot. There are two characters who pass in front, completely obscuring the sign. I want to use Remove to allow the illumination modeling to recreate the shadows. I created a single clean plate and am using clean plates exclusively. I have masks for each actor as they move across the sign. When I attempt to render, the moment one of the actors completely obscured the remove area, the render stops and give the message, "There should be at least one surface to fill. I extended the background layer so that it is never completely obscured, but this did not solve the problem.
Is there a way to resolve this, or do I have to break up the render into three separate passes (before the first actor, between the actors and after the second actor)?