[Koha] Koha 3 Error

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