Hi,
When I am trying to open my database it is giving me the following error.


SVRMGR> alter database open;
alter database open
*
ORA-00255: error archiving log 4 of thread 1, sequence # 4
ORA-00312: online log 4 thread 1: 'C:\ORA805\DATABASE\LOG1ORCL.ORA'
ORA-00294: invalid archivelog format specifier 'O'
SVRMGR>

Initialization Parameters
---------------------------
log_archive_dest = %ORACLE_HOME%\database\archive
log_archive_format = %ORACLE_SID%%S.%T
log_archive_start = TRUE

Please suggest

Thanks
Anurag