| ERROR | cannot ORDER objects without MAP or ORDER method |
| CAUSE | an object type must have a MAP or ORDER method defined for all comparisons other than equality and inequality comparisons. |
| ACTION | Define a MAP or ORDER method for the object type |
| ERROR | cannot ORDER objects without MAP or ORDER method |
| CAUSE | an object type must have a MAP or ORDER method defined for all comparisons other than equality and inequality comparisons. |
| ACTION | Define a MAP or ORDER method for the object type |