I even experimented with changing the permissions to your index.php files both equally in the public.html and admin folder and nonetheless doesnt work. removed openbay pro. I like to recommend seeking over the opencart marketplace to get a replacement. updated to latest sass compiler. the project experienced moved composer tags. https://seoservicepackage67765.madmouseblog.com/12298948/5-simple-techniques-for-opencart-google-tag-manager