I keep getting this error on a rolled sheet metal part while trying to flatten and/or unfold.

I've tried everything I can think of and I cannot understand why it is still giving me this error. I need to flatten this for a customer to be able to laser cut it.

I've attached the file in question in its entirety. this ultimately gets placed into an assembly but there should be no external references. I've even gone to the extent of contacting my companies solidworks dealer (who also does extensive solidworks training classes with certified instructors) and they can't even figure this out.