Aryze theme, fatal error, undefined function

[jos]

hi all,

I am switching from cmsms to getsimple, and a newbie concerning php
tried basic templates, work ok

Aryze looked promising, but last update 2012
After activation I get the following error:

Fatal error. Call to undefined function get_il8n_navigation( ) in c:\xampp\htdocs\getsimple\theme\aryze\header.php on

does the theme need update for getsimple v.3.3.1?
how to proceed?

txs for your help