ORA-00314: log % of thread 1, expected sequence# % doesn't match

When switch to standby database

alert occur in alert logfile for standby redologs.

problem in alert.log file:

Errors in file /u01/oracle/diag/rdbms/oradb/oradb/trace/uc4prod_arc4_27349.trc:
ORA-00314: log 7 of thread 1, expected sequence# 292376 doesn't match 292348
ORA-00312: online log 7 thread 1: '/u02/oradata/oradb/std_redo01.log'


solution:

alter database clear unarchived logfile group 7;