We do not support additionalProperties or empty object type. That's to say, whenever there's "type":object in the Swagger file, we expect "properties" field to be present with it.
There's an enhancement request AMBW-28424 to throw detailed error listing all the limitations on why a particular swagger to XSD generation fails
Issue/Introduction
Error "XSD Schema conversion error" while creating reference from the swagger(.json) file
Environment
All
Resolution
Workaround:
We expect "properties" field to be present, you can add dummy properties as shown below