" GTM no-script code not found: both lacking or not in " I try to include the script inside the header.tpl but there is no area. Update: Difficulty was solved. I just use Yet another addon and personalize hook to do it. Many thanks Ali Edited November 21, 2018 by https://nimmansocial.com/story7507927/5-essential-elements-for-prestashop-vs-opencart