The Cross Section Curve of Prismatic shape is either not planar or degenerate. Prismatic Shape graphics cannot be computed. Make sure that the Cross Section Curve is planar and non degenerate. - Intergraph Smart 3D - Administration

Intergraph Smart 3D Troubleshooting Reference

Intergraph Smart 3D
Administration & Configuration

Meaning: The cross-section curve of the prismatic shape is not planar, or the shape is degenerate. Because of this, Smart 3D cannot generate the shape.

Recovery: Edit the cross-section curve so that it is planar and not degenerate.