Oracle Message ORA-16800 - redo transport service for a standby database incorrectly set to ALTERNATE

ERRORredo transport service for a standby database incorrectly set to ALTERNATE
CAUSEThe redo transport service for a standby database was set to ALTERNATE when no other destination is 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.