Details: javax.persistence.PersistenceException: org.hibernate.id.IdentifierGenerationException: ids for this class must be manually assigned before calling save(): PFYoutubeDT11569: org.hibernate.id.IdentifierGenerationException: ids for this class must be manually assigned before calling save()Why is this error occuring?
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A quick google search for "Appian org.hibernate.id.IdentifierGenerationException" returned a bunch of results. Here is one of the threads where Mike Schmitt answered your question.
https://community.appian.com/discussions/f/process/25903/process-model-error
thank you Mathieu