ORA-31693: Table data object “SCOTT”.”MONITORED” failed to load/unload

ORA-31693: Table data object “SCOTT”.”MONITORED” failed to load/unload

Error
We are doing an export of one of big table and getting the below error:

Total estimation using BLOCKS method: 497.4 GB
Processing object type TABLE_EXPORT/TABLE/PROCACT_INSTANCE
ORA-31693: Table data object "SCOTT"."MONITORED" 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 33 with name "_SYSSMU33_2437304322$" too small
Processing object type TABLE_EXPORT/TABLE/TABLE

Parameter file used for Export process:

USERID=scott/
DIRECTORY=SCOTT_IMP
DUMPFILE=exp_scott_tables_%U.dmp
LOGFILE=exp_scott_tables.log
TABLES=SCOTT.MONITORED
FILESIZE=5G
COMPRESSION=all
PARALLEL=4
FLASHBACK_SCN=5890262615

Cause
Possible cause is table may be corrupted
With LOB object, we preferred not to use the parallel option as used in export process.

Solution
1. Analyse the table for check corruption

Analyze table SCOTT.MONITORED validate structure;
Analyze table SCOTT.MONITORED validate structure cascade;

2. Rerun the export without parallel option will hopefully fixed the issue.
Remove the PARALLEL Clause and use following Parameter file used for Export process:

USERID=scott/
DIRECTORY=SCOTT_IMP
DUMPFILE=exp_scott_tables_%U.dmp
LOGFILE=exp_scott_tables.log
TABLES=SCOTT.MONITORED
FILESIZE=5G
COMPRESSION=all
FLASHBACK_SCN=5890262615

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