Query in DR....

What is Right What is Wrong
Found a DBA giving following commands at standby site to switchover while standby database was mounted.

SQL> ALTER DATABASE COMMIT TO SWITCHOVER TO PRIMARY;
ALTER DATABASE COMMIT TO SWITCHOVER TO PRIMARY
*
ERROR at line 1:
ORA-16139: media recovery required

SQL> recover managed standby database disconnect;
Media recovery complete.
SQL> ALTER DATABASE COMMIT TO SWITCHOVER TO PRIMARY;
ALTER DATABASE COMMIT TO SWITCHOVER TO PRIMARY

ERROR at line 1:
ORA-16139: media recovery required
**********
from another SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE FINISH;

Database altered.

SQL> ALTER DATABASE ACTIVATE STANDBY DATABASE;

Database altered.