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O2U-00211:

A type without attributes was translated
Cause: OTT translated a type without attributes. The corresponding C-type will be a struct without any components, which is not legal C. The empty type in the database may be the result of an error during type creation. Additionally, incomplete types may be used temporarily in the creation of types that reference one another.
Action: Re-create a full version of the type in the database and then re-run OTT.