***N.28: An improper value for the intervals or the number of segments encountered by one of the Mesh operators.


***N.27: Improper value for the smooth size parameter encountered by one of the Mesh operators.


***N.26: The object selected for the Edit C-Mesh operator is not a C-Mesh (mesh with controls). 


***N.25: Improper entity selected for the Edit C-Mesh operator: it should be a controlled mesh. 


***N.24: No entity or more than one entity selected for the Edit C-Mesh operator.


***N.23: Irregularities encountered while in Mesh Edit mode. 


***N.22: Unable to complete the derivation of the opposite side of the mesh for the Create C-Mesh, Edit C-Mesh, or Query operator. 


***N.21: Unable to complete the derivation of the mesh for the Create C-Mesh, Edit C-Mesh, or Query operator. 


***N.20: Unable to complete the derivation of the control net for the Create C-Mesh operator. 


***CP.19: Inappropriate path object selected for the Place operator.


***CP.18: The system stopped placing copies of the source object, since the next position is beyond the end of the path object. 


***CP.17: Inappropriate source object selected for the Place operator.


***CP.16: While in Repeat Copy or Multi-Copy mode, positions on different objects were entered for the Place operator.  Positions should be on the same object. 


***CP.15: The system was unable to determine the position of the source shape. 


***CP.14: Inappropriate or no entities were selected for the Place operator. 


***N.13: An open face encountered when generating reverse faces.


***N.12: The C-Mesh operator encountered irregularities and cannot complete the operation.


***N.11: Some of the control lines selected are open and some are closed (Create C_Mesh operator).


***N.10: While the Same # Of Points option is selected for the Create C-Mesh operator, control lines with variable numbers of points have been encountered.



***N.9: Improper type of object selected for the Create C-Mesh operator. 



***N.8: Improper entity encountered by the Create C-Mesh operator.



***N.7: No entity or less than two entities selected for the Create C-Mesh operator.



***N.6: Improper knot values encountered or knot values are missing.


***N.5: Improper weight values encountered or weight values are missing.



***N.4: For the NURBS and the B-Splines, the currently selected degree value should be less than the number of points in the line selected for smoothing.



***N.3: Improper type of object selected for the Smooth Curve operator.



***N.2: Improper entity selected for the Smooth Curve operator.



***N.1: No entity selected for the Smooth Curve operator.