| Error number | Error message |
|---|---|
| 0 | No error. |
| 1 | number of input data must be > 9 |
| 2 | NLS must be .GT. 9 |
| 3 | number of data points used in least squares fit must be > 9 |
| 4 | NFL (number of points used to calculate weights) must be at least 1 |
| 5 | number of points used in least squares fit too large |
| 6 | number of points used in calculating weights too large |
| 7 | cell grid dimensions must be positive |
| 8 | duplicate input points encountered |
| 9 | collinear input, no unique solution |
| 10 | at least two points must have different X coordinates |
| 11 | at least two points must have different Y coordinates |
| 12 | at least two points must have different Z coordinates |
| 13 | no cells contain a point within the radius of influence of the input point |
| 14 | negative search radius in calculating least squares fit |