How to resolve ORA-31693: Table data object "TEST_ENKL50"."PREVIEW" failed to load/unload and is being skipped due to error: while I expdp oracle db

How to resolve problem while export oracle using expdp in oracle 10g

ORA-31693: Table data object "TEST_ENKL50"."PREVIEW" 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 6 with name "_SYSSMU6$" too small
KatDBAAsked:
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