[Q]Delete error?

What's mean?
Must I do?
"
  1* delete from headers where s_time<'19971231' SQL> /
delete from headers where s_time<'19971231'

            *
ERROR at line 1:
ORA-01562: failed to extend rollback segment (id = 15) ORA-01650: unable to extend rollback segment R03 by 2560 in tablespace RBS Received on Sat Jul 11 1998 - 23:42:41 CDT