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You may hit with that error code during the export process. I faced with those error on Oracle 12c database.
Complete error messages are:
ORA-31693: Table data object "SCHEMA"."TABLE_NAME_HERE" failed to load/unload and is being skipped due to error: ORA-02354: error in exporting/importing data ORA-01555: snapshot too old: rollback segment number 21 with name "_SYSSMU21_2773200038$" too small
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