Oracle Solution for Error ora-16700

ORA-16700: the standby database has diverged from the primary database

What triggered the Error:

The primary database may have been flashed back or restored from a backup set and then reopened with the RESETLOGS option.

What should we do to fix it:

Re-create the standby database from the primary database or flash back the standby database to the same point the primary database had been flashed back to.