[Koha] Koha 3 Error

[Franklin Escano]

Hi,
I have installed Koha 3 Beta 2 on Ubuntu 8.04 Hardy Heron and I got
the following message:
===============================================
Koha error
The following fatal error has occurred:
Can't use an undefined value as an ARRAY reference at
/usr/local/lib/perl/5.8.8/YAML/Syck.pm line 72.
===============================================
The message appeared after i configured koha on
http://servername:8080. I finished all the configuration and checked
all options.
What could be wrong

Franklin D. Escano
Philippines