| 0 | SUCCESS | GNOLL Completed Successfully |
| 1 | BAD_ALLOC | Issue with memory allocation |
| 2 | BAD_FILE | Issue with file read/writing |
| 3 | NOT_IMPLEMENTED | Feature not Implemented yet |
| 4 | INTERNAL_ASSERT | Internal Assertion (Should not be encountered. Please file a bug) |
| 5 | UNDEFINED_BEHAVIOUR | Feature not defined. Faulty Statement |
| 6 | BAD_STRING | Issue with string functions |
| 7 | OUT_OF_RANGE | Value over max or under min of numeric range |
| 8 | IO_ERROR | Issue with printing |
| 9 | MAX_LOOP_LIMIT_HIT | Looping / Recursion Limit reached |
| 10 | SYNTAX_ERROR | The dice notation cannot be parsed and is likely malformed |
| 11 | DIVIDE_BY_ZERO | Division by zero cannot be done |
| 12 | UNDEFINED_MACRO | Attempt to access macro that was not defined |