Brbackup error for java stack(java+ep)

Hi,

I have installed EP with java engine .

I am not able to take backup using brback,

I am attatching the brbackup log

==========================================

BR0051I BRBACKUP 7.00 (11)

BR0055I Start of database backup: bduuuhoi.afd 2007-03-14 16.46.32

BR0477I Oracle pfile F:\oracle\EPS\database\initEPP.ora created from spfile F:\oracle\EPS\database\spfileEPP.ora

BR0280I BRBACKUP time stamp: 2007-03-14 16.46.36

BR0301W SQL error -1031 at location BrbDbLogOpen-5

ORA-01031: insufficient privileges

BR0324W Insertion of database log header failed

BR0280I BRBACKUP time stamp: 2007-03-14 16.46.36

BR0301W SQL error -1031 at location BrDbfInfoGet-30

ORA-01031: insufficient privileges

BR0280I BRBACKUP time stamp: 2007-03-14 16.46.36

BR0301W SQL error -1031 at location BrDbfInfoGet-31

ORA-01031: insufficient privileges

BR0280I BRBACKUP time stamp: 2007-03-14 16.46.36

BR0301E SQL error -1031 at location BrComprDurGet-1

ORA-01031: insufficient privileges

BR0314E Collection of information on database files failed

BR0280I BRBACKUP time stamp: 2007-03-14 16.46.36

BR0301W SQL error -1031 at location BrbDbLogOpen-5

ORA-01031: insufficient privileges

BR0324W Insertion of database log header failed

BR0056I End of database backup: bduuuhoi.afd 2007-03-14 16.46.36

BR0280I BRBACKUP time stamp: 2007-03-14 16.46.36

BR0054I BRBACKUP terminated with error

===============================================

please suggest what needs to be done.

Thanks and Regards

Atrai