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No matter what I do, when I click “Go to process” I get the message “More than one object on the canvas. Please delete extra objects and keep only one.” It will do this even if I only have one object. If I go through the “Batch Fill” process with multiple items, it will recognize the items and fill them, however, I will get the same “…more than one object…keep only one…” message when I click “go to process”. I have watched tutorials and several videos and followed each step. I even adjusted the light so there weren't shadows. I've used non-reflective material. The material is not black.  Help!