| ERROR | grdHeight and/or Height array sizes incorrect |
| CAUSE | The sizes of grdHeight and Height arrays were not equal to half the size of input 2-D polygons ordinates array. As a result, each point in the 2-D polygon could not be extruded from the grdHeight entry to the Height entry. |
| ACTION | Ensure that the sizes of the grdHeight and Height arrays are half that of input 2-D polygon ordinates array. |