ORA-01031: insufficient privileges

Hi

When i have perform cleanup logs through DB13 it shows following errors --

BR0301E SQL error -1031 at location dblog_cleanup-5

ORA-01031: insufficient privileges

BR0301E SQL error -1031 at location dblog_cleanup-6

ORA-01031: insufficient privileges

there is no problem when i have perform other SAP DBA Operations.

Regards

Vikram