I had this exact same error in a basic level, and it was referencing a floor and 4 walls that were not that big, like the width of a large house for the walls and the width/length of 4 large houses for the floor. Plus, I even disabled cast shadows on the floor. How I got rid of the error message is setting the meshes to stationary, I think. It may require also setting one or more of the lights to stationary too. But any time I switch the meshes or the lights to dynamic, the error occurs again. It should be a warning w/o the turning off of the shadow render.
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