" GTM no-script code not found: either lacking or not in " I test to incorporate the script while in the header.tpl but there is no section. Update: Problem was solved. I just use Yet another addon and customise hook to do it. Many thanks Ali Edited November 21, 2018 https://addons.prestashop.com/es/seo-posicionamiento-buscadores/30904-etiquetas-automaticas-hreflang-canonical-etiquetas-seo.html