[Koha] problem in cataloging

Hello Friends I write from La Paz Bolivia, install Koha version v3.06 and I have the following problem in cataloging in MARC21: Can't call method "fields" on an undefined value at /usr/share/koha/lib/C4/Biblio.pm line 2261. Can you help please. Thank you. -- Christian Jhonny Calle Jahuira TUTOR ELEARNING - UMSA Consultor Sistemas de Informacion de Bibliotecas de la UMSA Email: christianjcj@gmail.com Cel: 73017301 - 65151595