How do you make blob shadow ignore sphere?

I've created a sphere in Unity and have made it move around the terrain. I also attached a blob shadow to the sphere but the shadow is not ignoring the sphere and for some reason I can't tell it to ignore the sphere (it's not one of the options in the Ignore Layers list). Is there another way I can make the blob shadow projector ignore the sphere?

You can't ignore objects, you ignore layers. So put the sphere on a layer you want the projector to ignore.