[Koha] Can't call method "append_fields"

[constantine]

Yes, the previous problem was solved, indeed...

I do not understand why I have so many  problems installing koha,..
maybe the last years I was too used to Joomla! installations :D

So the challenging koha that its concept I so much admire and embrace
makes me face another problem.

Trying to add a MARC record, (I retrieved its data from a z30.50
server, but that does not matter, I think) and then I am getting an
error page (http://localhost:8080/cgi-bin/koha/cataloguing/additem.pl)

Its contents are:
"
Koha error
The following fatal error has occurred:
Can't call method "append_fields" on an undefined value at
/usr/local/share/perl/5.10.0/MARC/File/SAX.pm line 95. at
/usr/local/lib/perl/5.10.0/XML/LibXML/SAX.pm line 64
 at /usr/local/share/perl/5.10.0/MARC/File/XML.pm line 443
Apache	Server version: Apache/2.2.9 (Debian) Server built: Jun 21 2008 10:35:35
Koha	3.00.00.094
Koha DB	3.0000094
MySQL	mysql Ver 14.12 Distrib 5.0.51a, for debian-linux-gnu (i486)
using readline 5.2
OS	Linux sangre 2.6.25.9xx6-costis07 #1 SMP PREEMPT Wed Jul 2 02:35:38
EEST 2008 i686 GNU/Linux
Perl	5.010000
"

The laste contens of /var/log/koha/koha-error_log are

[...] [error] [...] [...] addbiblio.pl: INDEXING :orignew at
/usr/share/koha/lib/C4/Biblio.pm line 2319., referer:
http://localhost:8080/cgi-bin/koha/cataloguing/addbiblio.pl?biblionumber=0&z3950=1&frameworkcode=BKS&breedingid=1
[...] [error] [...] [...] addbiblio.pl: INDEXING :1 at
/usr/share/koha/lib/C4/Biblio.pm line 2319., referer:
http://localhost:8080/cgi-bin/koha/cataloguing/addbiblio.pl?biblionumber=0&z3950=1&frameworkcode=BKS&breedingid=1
[...] [error] [...] [...] addbiblio.pl: INDEXING :ocip at
/usr/share/koha/lib/C4/Biblio.pm line 2319., referer:
http://localhost:8080/cgi-bin/koha/cataloguing/addbiblio.pl?biblionumber=0&z3950=1&frameworkcode=BKS&breedingid=1
[...] [error] [...] [...] addbiblio.pl: INDEXING :20 at
/usr/share/koha/lib/C4/Biblio.pm line 2319., referer:
http://localhost:8080/cgi-bin/koha/cataloguing/addbiblio.pl?biblionumber=0&z3950=1&frameworkcode=BKS&breedingid=1
[...] [error] [...] [...] addbiblio.pl: INDEXING :y-gencatlg at
/usr/share/koha/lib/C4/Biblio.pm line 2319., referer:
http://localhost:8080/cgi-bin/koha/cataloguing/addbiblio.pl?biblionumber=0&z3950=1&frameworkcode=BKS&breedingid=1
[...] [error] [...] [...] addbiblio.pl: INDEXING :ddc at
/usr/share/koha/lib/C4/Biblio.pm line 2319., referer:
http://localhost:8080/cgi-bin/koha/cataloguing/addbiblio.pl?biblionumber=0&z3950=1&frameworkcode=BKS&breedingid=1
[...] [error] [...] [...] addbiblio.pl: INDEXING :SR at
/usr/share/koha/lib/C4/Biblio.pm line 2319., referer:
http://localhost:8080/cgi-bin/koha/cataloguing/addbiblio.pl?biblionumber=0&z3950=1&frameworkcode=BKS&breedingid=1
[...] [error] [...] [...] addbiblio.pl: INDEXING :pc15 2006-07-19 to
SSCD at /usr/share/koha/lib/C4/Biblio.pm line 2319., referer:
http://localhost:8080/cgi-bin/koha/cataloguing/addbiblio.pl?biblionumber=0&z3950=1&frameworkcode=BKS&breedingid=1
[...] [error] [...] [...] addbiblio.pl: INDEXING :jp00 2006-07-26 CIP
recd at /usr/share/koha/lib/C4/Biblio.pm line 2319., referer:
http://localhost:8080/cgi-bin/koha/cataloguing/addbiblio.pl?biblionumber=0&z3950=1&frameworkcode=BKS&breedingid=1
[...] [error] [...] [...] addbiblio.pl: INDEXING :jp20 2006-07-26 to
subj at /usr/share/koha/lib/C4/Biblio.pm line 2319., referer:
http://localhost:8080/cgi-bin/koha/cataloguing/addbiblio.pl?biblionumber=0&z3950=1&frameworkcode=BKS&breedingid=1
[...] [error] [...] [...] addbiblio.pl: INDEXING :jp03 2006-07-26 at
/usr/share/koha/lib/C4/Biblio.pm line 2319., referer:
http://localhost:8080/cgi-bin/koha/cataloguing/addbiblio.pl?biblionumber=0&z3950=1&frameworkcode=BKS&breedingid=1
[...] [error] [...] [...] addbiblio.pl: INDEXING :aa05 2006-07-27 at
/usr/share/koha/lib/C4/Biblio.pm line 2319., referer:
http://localhost:8080/cgi-bin/koha/cataloguing/addbiblio.pl?biblionumber=0&z3950=1&frameworkcode=BKS&breedingid=1
[...] [error] [...] [...] addbiblio.pl: INDEXING :1 at
/usr/share/koha/lib/C4/Biblio.pm line 2319., referer:
http://localhost:8080/cgi-bin/koha/cataloguing/addbiblio.pl?biblionumber=0&z3950=1&frameworkcode=BKS&breedingid=1
[...] [error] [...] [...] addbiblio.pl: INDEXING :1 at
/usr/share/koha/lib/C4/Biblio.pm line 2319., referer:
http://localhost:8080/cgi-bin/koha/cataloguing/addbiblio.pl?biblionumber=0&z3950=1&frameworkcode=BKS&breedingid=1
[...] [debug] mod_deflate.c(619): [...] Zlib: Compressed 37993 to 5966
: URL /cgi-bin/koha/cataloguing/additem.pl, referer:
http://localhost:8080/cgi-bin/koha/cataloguing/addbiblio.pl?biblionumber=0&z3950=1&frameworkcode=BKS&breedingid=1
[...] [error] [...] [...] additem.pl: Can't call method
"append_fields" on an undefined value at
/usr/local/share/perl/5.10.0/MARC/File/SAX.pm line 95. at
/usr/local/lib/perl/5.10.0/XML/LibXML/SAX.pm line 64, referer:
http://localhost:8080/cgi-bin/koha/cataloguing/additem.pl?biblionumber=1&frameworkcode=BKS
[...] [error] [...] [...] additem.pl:  at
/usr/local/share/perl/5.10.0/MARC/File/XML.pm line 443, referer:
http://localhost:8080/cgi-bin/koha/cataloguing/additem.pl?biblionumber=1&frameworkcode=BKS

What could I do to solve this problem?

Tsardounis Constantine
http://costis.name