" GTM no-script code not found: possibly missing or not in " I try to add the script within the header.tpl but there's no portion. Update: Problem was solved. I just use A further addon and customise hook to get it done. Thanks Ali Edited November 21, 2018 by QNP https://addons.prestashop.com/fr/seo-referencement-naturel/30904-balises-hreflang-automatiques-et-balises-canoniques-seo.html