Brbackup Success with warnings

Dear,

When I am taking Full offline bakup + Redolog with Brtools via DB13 . It finish with warning and give the messege.

Return Code 0001 Success with warnings

and Detail Log

BR0051I BRBACKUP 7.00 (18)

BR0055I Start of database backup: bdzgowem.aft 2008-11-16 03.00.36

BR0477I Oracle pfile /oracle/DEV/102_64/dbs/initDEV.ora created from spfile /oracle/DEV/102_64/dbs/spfileDEV.ora

BR0083W Compression rates out of date - run BRBACKUP with option '-k only'

What to do Plesae help

Thanks

manu