| ERROR | : instance must of be of type string or one of its subtypes |
| CAUSE | The run-time type of the instance is the not declared type or one of its subtypes. e.g. TREAT(supertype AS subtype) fails. |
| ACTION | Catch the exception. |
| ERROR | : instance must of be of type string or one of its subtypes |
| CAUSE | The run-time type of the instance is the not declared type or one of its subtypes. e.g. TREAT(supertype AS subtype) fails. |
| ACTION | Catch the exception. |