Error when i try to list products from a vendor

-- HikaShop version -- : 2.6.0
-- Joomla version -- : 3.4.1
-- Error-message(debug-mod must be tuned on) -- : Fatal error: Class 'ImageHelper' not found in /home/quai/websites/artperfcom/modules/mod_tz_hikashop/tmpl/default.php on line 21

Hello, i got this error when i try to use hikashop module to list some products (i have hikamarket installed) :

Fatal error: Class 'ImageHelper' not found in /home/quai/websites/artperfcom/modules/mod_tz_hikashop/tmpl/default.php on line 21

Hi,

I'm sorry but I don't know what that "mod_tz_hikashop" is and it's not something provided by HikaMarket or HikaShop.

Regards,