Oracle Message ORA-16740 - redo transport service for standby database string incorrectly set to ALTERNATE

ERRORredo transport service for standby database string incorrectly set to ALTERNATE
CAUSEThe redo transport service to the standby database was set to ALTERNATE when no other destination was set to alternate to this destination.
ACTIONReenable the standby database or the entire configuration to allow the configuration property settings to be propagated to the initialization parameters.