Oracle Message ORA-16171 - RECOVER...FINISH not allowed due to gap for thr string, seq string-string

ERRORRECOVER...FINISH not allowed due to gap for thr string, seq string-string
CAUSESee alert log for more details
ACTIONCopy missing archived logs from primary or another standby. Register the logs and re-issue the RECOVER...FINISH command. If the logs are not available, issue the ALTER DATABASE RECOVER MANAGED STANDBY SKIP command to ignore the standby redo log files.