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oracle 12 c / sql nav 7.3 / can not extract ddl for tablespaces

We are not able to extract DDL for tablespaces on oracle 12c.

3:03:54 PM Executing Extract DDL …
3:03:54 PM Start Extract DDL for 1 object(s) …
3:03:54 PM Generating DDL for CLIENT_LOB
3:03:54 PM ORA-01789: query block has incorrect number of result columns
3:03:54 PM Extract DDL complete
3:03:54 PM End Extract DDL for 1 object(s)