Snapshot too old

I am refreshing a materialized view and occasionally receive the below error. Should I be looking at the local database rollback segment or the remote databases rollback segment? As I don't believe anything is running locally it must be on the remote database, but wanted to verify before I start trying to tune/fix the issue in the wrong database.

ORA-12012: error on auto execute of job 42 
ORA-12008: error in materialized view refresh path 
ORA-01555: snapshot too old: rollback segment number with name "" too small 
ORA-02063: preceding line from FEMA_ODS 
ORA-06512: at "SYS.DBMS_SNAPSHOT", line 2251 
ORA-06512: at "SYS.DBMS_SNAPSHOT", line 2457 
ORA-06512: at "SYS.DBMS_IREFRESH", line 685 
ORA-06512: at "SYS.DBMS_REFRESH", line 195 
ORA-06512: at line 1

Thanks
Bill

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