| Error Code | Cause | Action |
| 01 | Symbol is multiply defined | Second occurrence ignored |
| 02 | Badly formed expression | Value of 0, absolute used |
| 03 | Syntax Error | Line treated as comment |
| 04 | Expression gives wrong mode | Line treated as comment |
| 05 | Maxium number of operands exceeded | Use only first 12 operands |
| 06 | Illegal opcode | |
| 07 | Illegal data specification | Value defined as byte or word, 0h |
| 08 | Value out of range | Value = 0 |
| 09 | Undefined symbol | Treat line as comment |
| 10 | Jump out of range | Jump as close as possible |
| 11 | Relocation error detected | Value = 0, absolute |
| 12 | Reserved word used as a symbol | Treat line as a comment |
| 13 | Attempt to nest procedures | Treat line as a comment |