Meshing errors

I'm trying to mesh a part that is, by my standards, very simple.  It is designed in Solidworks and imported to HyperMesh in .STEP format.  I have been trying to use tetramesh with trias/tetras and a 0.100 element size, which produces errors 'shell elem region incomplete' followed by '1 surfs failed and saved'.  The resulting mesh is a 2D surface instead of a 3D solid.  All I would like is assistance in making the mesh solid and eliminating these errors. 

Also for some reason I can't upload any files - not .hm, not .step, not .iges.  So I have attached a picture of the design if that helps at all

<?xml version="1.0" encoding="UTF-8"?>

<?xml version="1.0" encoding="UTF-8"?>

<?xml version="1.0" encoding="UTF-8"?>