SAP - brbackup BR0301E logon denied

If you encounter SAP error while trying to use SAP brbackup as below

./brbackup -t online -p initERD_online.sap

BR0055I Start of database backup: bedgvjjf.and 2010-05-21 14.48.27
BR0484I BRBACKUP log file: /oracle/ERD/sapbackup/bedgvjjf.and
BR0280I BRBACKUP time stamp: 2010-05-21 14.48.27
BR0301E SQL error -1017 at location BrDbConnect-2, SQL statement:
'CONNECT system/*******'
ORA-01017: invalid username/password; logon denied
BR0310E Connect to database instance ERD failed
BR0280I BRBACKUP time stamp: 2010-05-21 14.48.27

The error is due to the you need to put this "-u /" login as local user

./brbackup -u / -t online -p initERD_online.sap