FATAL ERROR - Call to undefined function userBuildRoute()

[ewadrel]

hello,

I have a problem on a VirtueMart 2.0.2 + Joomla 1.5.3 website.
Have installed the packs and everything went well. Configuration OK also. However, I'm meeting a 'Call to undefined function userBuildRoute()' error on page
/user/editaddresscartBT when clicking on the checkout form button.
You can try on http://www.peraudiere.com/la-boutique/user/editaddresscartBT or http://www.peraudiere.com/la-boutique
Look at the source code, error is obvious. Have thought about a path problem but I'm not sureAny idea where this can come from ?

Any idea very welcome.

Best

Ewadrel