[DFDL-WG] cobol copybook xsd generation error

I generated a xsd for cobol copybook format through IIB 10.0.0.3, but after the schema was generated, it had a red X on the schema and when I tried to create a logical instance, it just says there are some errors with the schema, but doesn't say what error. Some of the xsd I generated were fine but some had this error. And when ran the thing through serialization I got the following error, any ideas what's going on here? ErrorHandler: processingError() CTDU4001E: Root element 'RTW23' in namespace '' does not exist.Writing output data