| ERROR | no valid rules index for this model-rulebase combination |
| CAUSE | A valid rules index did not exist for specified combination of models and rulebases. |
| ACTION | Create a rules index for the specified models and rulebases combination, or use a combination of models and rulebases for which a rules index exists, and retry the operation. Also ensure that the rules index status matches the status for the rules index specified in the query. |