ORA-00313: open failed for members of log group

ORA-00313: open failed for members of log group 4 of thread 0
ORA-00312: online log 4 thread 0: '/opt/oracle/oradata/xxxdb/standbyredo04.log'
ORA-27037: unable to obtain file status
Linux Error: 2: No such file or directory
Additional information: 3
CJQ0 started with pid=18, OS id=13456
Thu Jul 15 21:00:02 2010
Errors in file /opt/oracle/admin/xxxdb/bdump/xxxdb_arc2_13450.trc:
ORA-00313: open failed for members of log group 5 of thread 0
ORA-00312: online log 5 thread 0: '/opt/oracle/oradata/xxxdb/standbyredo05.log'
ORA-27037: unable to obtain file status
Linux Error: 2: No such file or directory
Additional information: 3
Thu Jul 15 21:00:03 2010
Errors in file /opt/oracle/admin/xxxdb/bdump/xxxdb_arc2_13450.trc:
ORA-00313: open failed for members of log group 6 of thread 0
ORA-00312: online log 6 thread 0: '/opt/oracle/oradata/xxxdb/standbyredo06.log'
ORA-27037: unable to obtain file status
Linux Error: 2: No such file or directory
Additional information: 3
Thu Jul 15 21:00:04 2010
Errors in file /opt/oracle/admin/xxxdb/bdump/xxxdb_arc2_13450.trc:
ORA-00313: open failed for members of log group 7 of thread 0
ORA-00312: online log 7 thread 0: '/opt/oracle/oradata/xxxdb/standbyredo07.log'
ORA-27037: unable to obtain file status
Linux Error: 2: No such file or directory
Additional information: 3


select * from v$log;
select group#, sequence#, bytes, members, status from v$log;

column MEMBER format a50
select * from v$logfile;

ALTER DATABASE DROP LOGFILE GROUP 4;
ALTER DATABASE DROP LOGFILE GROUP 5;
ALTER DATABASE DROP LOGFILE GROUP 6;
ALTER DATABASE DROP LOGFILE GROUP 7;

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