[Koha] Cant call method error

Hi, Iam using koha 3.08.07.000  ubuntu 12.4LTS,iam getting the below error when trying to add items on catalogue or doing  circulation. 1.Zebra is running 2.Rebuild of index done Help us solve. Can't call method "subfield" on an undefined value at /usr/share/koha/lib/C4/Biblio.pm Regards. MICHAEL 0732677025