Oracle Error ORA-10647: Tablespace other than SYSTEM, string, string not found in read only mode

Oracle Error Message

ORA-10647: Tablespace other than SYSTEM, string, string not found in read only mode

Reason for the Error

When SYSTEM tablespace is being migrated, tablespaces other than the three should be ALTERed to read only.

Solution

Alter the tablespace status to read only and retry migration.