Use this solution if the rollback segment does not exist:

1. Modify the init.ora file to remove from the ROLLBACK_SEGMENTS list the name of the rollback segment that does not exist. (i.e. remove the rollback segment named in the ORA-01534 error.)

2. Save the new changes in the init.ora file and restart the database.

3. After the database opens, run the following query:
select segment_name, status from dba_rollback_segs;

Compare the output from this query with the ROLLBACK_SEGMENTS list in the init.ora fileto ensure that the ROLLBACK_SEGMENTS list is complete.