Greetings, I'm from Hawassa University a place 271Km from capital city Addis Ababa, Ethiopia. Currently we are moving to use Koha for our Library. I had upgraded from 2.2 to 3.0 on Ubuntu 8.04 and I was successful using the manuals for installation and upgrading from Koha-duke site. But when the librarians are adding items in to the database, it will show us "production mode - trapped fatal error" . the error in koha log file states that " [Tue Sep 08 15:59:07 2009] [error] [client ...] [Tue Sep 8 15:59:07 2009] additem.pl: Can't call method "append_fields" on an undefined value at /usr/local/share/perl/5.8.8/MARC/File/SAX.pm line 92. at /usr/local/lib/perl/5.8.8/XML/LibXML/SAX.pm line 73, referer: http://lis.hu.edu.et:8080/cgi-bin/koha/cataloguing/additem.pl?biblionumber=3... "[Tue Sep 08 15:59:07 2009] [error] [client ...] [Tue Sep 8 15:59:07 2009] additem.pl: at /usr/local/share/perl/5.8.8/MARC/File/XML.pm line 445, referer: http://lis.hu.edu.et:8080/cgi-bin/koha/cataloguing/additem.pl?biblionumber=3... please any help!!