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What causes a shadow supervisor surface error?

I'm attempting to use PCL to stitch several surfaces together into a composite surface using sgm_create_surface_composite(). 
 
I'm obtaining an error on some of the operations which reads:
$#   CompTrimSurface Build Error -- The Shadow Supervisor Surface must be 
$# PLANAR!
 
and on other surfaces:
$#   Unable to project outer loop to Shadow Surface Plane.
 
What could be causing this? It works manually, or if I run a snippet of the code in PATRAN itself.
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