ORA-16807: unable to change database protection mode

Cause : An attempt to issue the ALTER DATABASE SET STANDBY TO MAXIMIZE {PROTECTION | AVAILABILITY | PERFORMANCE} failed.

Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts

Check the Oracle alert log and Data Guard broker log for more information.

update : 20-08-2017
ORA-16807

ORA-16807 - unable to change database protection mode
ORA-16807 - unable to change database protection mode

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    Well, the reason for above error is that i have taken the above script from a 11g database and running it on 10g database. 11g has bring some changes in password management. Below code is executed on 11g and user created successfully, which is expected result.