Oracle® Database 11g / 12c / 18c error codes EXP-00061: unable to find the outer table name of a nested table

EXP-00061: unable to find the outer table name of a nested table

Oracle Error Code: EXP-00061

Cause: While exporting a bitmap index or posttable action on an inner nested table, the name of the outer table could not be located, using the NTAB$ table.

Action: Verify the table is properly defined.