Hello - Koo break when try to open a form.

When I try to open a form view "i.e. an invoice" the client is closed and this message appear on logs.

-- Fallo de segmentación

When the client start the log say:

El módulo 'dbus' no está disponible. Considere instalarlo para que otras aplicaciones puedan interactuar fácilmente con Koo.
Could not read from serial device. Serial Barcode Scanner stopped.

To try to solve the "dbus" problem, i made sudo aptitude install dbus-qt-1 and this is installed. But the message follow appearing.

Im using Ubuntu 9.10 running koo with "python2.5" in this way:

$python2.5 koo.py

Thanks in advance for your answer,!