Upgrading zaptel modules

Hi, i have installed the trixbox CE 2.6.0.7 from the ISO file of www.trixbox.org.
I go in the web GUI of the trixbox and under menu "packages" i choose to upgrade the:
476 zaptel driversDrivers, tools and libraries for Zapata telephony interfaces to 1.4.10-1
477 zaptelmodules Zaptel kernel modules to 1.4.9.2-8.2.6.18_53.1.4.el5

When i restart the box i get the message:

ioctl(ZT_LOADZONE) failed: Invalid argument
Notice: Configuration file is /etc/zaptel.conf
line 12: Unable to register tone zone 'us'
ZT_DEFAULTZONE failed: Invalid argument (22)

and when i run the command ztcfg -vvvv i get the same:

Zaptel Version: 1.4.9.2
Echo Canceller: OSLEC
Configuration
======================

Channel map:

Channel 01: FXS Kewlstart (Default) (Slaves: 01)

1 channels to configure.

ioctl(ZT_LOADZONE) failed: Invalid argument
Notice: Configuration file is /etc/zaptel.conf
line 12: Unable to register tone zone 'us'
ZT_DEFAULTZONE failed: Invalid argument (22)

What is the problem? can anyone help?

Regards,

John