Error: ORA-16651: requirements not met for enabling fast-start failover

When I try to enable the fast start failover in the data guard below I got the below error message

Error: ORA-16651: requirements not met for enabling fast-start failover

DGMGRL> show configuration;

Configuration - DG_BHU

  Protection Mode: MaxAvailability

  Databases:

    BHU_A - Primary database

    BHU_B - Physical standby database

Fast-Start Failover: DISABLED

Configuration Status:

SUCCESS

DGMGRL> show fast_start failover;

Fast-Start Failover: DISABLED

  Threshold:        90 seconds

  Target:           (none)

  Observer:         Bhuvan_observer

  Lag Limit:        30 seconds

  Shutdown Primary: TRUE

  Auto-reinstate:   TRUE

Configurable Failover Conditions

  Health Conditions:

    Corrupted Controlfile          YES

    Corrupted Dictionary           YES

    Inaccessible Logfile            NO

    Stuck Archiver                  NO

    Datafile Offline               YES

  Oracle Error Conditions:

    (none)

DGMGRL> enable fast_start failover;

Error: ORA-16651: requirements not met for enabling fast-start failover

Failed.

SOLUTION

1)  Check whether the flashback database is enabled on primary & standby database

Select flashback_on from gv$database;

2) Check whether you have set the FastStartFailoverTarget parameter.

Ex:

 edit database 'BHU_A' set property FastStartFailoverTarget='BHU_B';

edit database 'BHU_B' set property FastStartFailoverTarget='BHU_A';