iPrint Appliance I cannot print libreoffice files in mobile devices

Printing libreoffice, html and txt files stopped to work in mobile devices.

In the log file /var/opt/novell/log/iprintmobile the following error appears:

"com.novell.service.iPrint.mobile.converter.openof fice.OOConverter verifyConversion
WARNING: Not converted file: /var/opt/novell/iprintmobile/drivers/spool/print.prn "

I'm using Novell iPrint Appliance v. 1.0.1.

I tested from the iphone and android smartphones.

Can anyone help me?