NLU Model training creates a new record in table [ml_solution] for the trained NLU Model solution throwing an error and unable to publish or test, as the "Publish" button is greyed out. - Known Error

NLU Model training creates a new record in table [ml_solution] for the trained NLU Model solution throwing an error and unable to publish or test, as the "Publish" button is greyed out. Description After transferring an NLU Model to a target instance via an Update Set, when you train the NLU Model, the state does not change and the "Publish" button is greyed out, either caused by a duplicate Version record in table [ml_solution] or there is a version mismatch for the NLU Model in tables [ml_solution], [sys_nlu_model_status] and [ml_capability_definition_base].

The symptoms will be:

1. The Publish button is not available and greyed out 2. When using the NLU Model Builder within Studio, it will not be possible to train the NLU Model, as it keeps spinning and the page might appear to freeze.

Steps to Reproduce

Transfer an NLU Model to the target instance, which was on a different version of the NLU Model, and there is an NLU Model version mismatch in tables [ml_solution], [sys_nlu_model_status] and [ml_capability_definition_base].

Workaround To resolve the issue, delete the latest NLU Model Solution record [ml_solution] in table [ml_solution], as follows:

1. Go to ml_solution.list 2. Check all records for the same Solution Name 3. Check for the record with the latest Version number that has active=false 4. Delete the [ml_solution] record with the latest Version number that has active=false 5. Retrain the NLU model, and once successfully trained, the Publish button will no longer be greyed out

The Versions for the NLU Model in tables [ml_solution], [sys_nlu_model_status] and [ml_capability_definition_base] will now match.