| ERROR | DEFINE or UNDEFINE command has no arguments |
| CAUSE | DEFINE and UNDEFINE command need users to input the substitution variable name. |
| ACTION | Input the vairable name follow after the DEFINE or UNDEFINE |
| ERROR | DEFINE or UNDEFINE command has no arguments |
| CAUSE | DEFINE and UNDEFINE command need users to input the substitution variable name. |
| ACTION | Input the vairable name follow after the DEFINE or UNDEFINE |