Prestashop Google tag 500 error solution

[sundar]

suggest to make this steps:

1) REMOVE THE COMMENTS

          <!-- Google Tag Manager -->

          <!-- End Google Tag Manager -->

2) open a tag

           {literal} and close it at the end of each snipplet {/literal}

{literal}
                <noscript><iframe src="https://www.googletagmanager.com/ns.html?id=XXXXXXX" height="0" width="0" style="display:none;visibility:hidden"></iframe></noscript>

{/literal}

 Note* - Insert in: head.tpl  (and not header.tpl) one part and the other in layout-both-columns.tpl

Check if everything is fine via the Chrome Add-on Google-Tag-Assistent