My script is not appearing on the site

[Chris Dickinson]

I installed your plugin, added a googletagmanager script to the header, but on the website the script is nowhere to be found on the page (source code). Is the plugin broken ?

[Chris Dickinson]

PS: the Theme I'm using is Lucille and it's header.php contains

<?php wp_head(); ?>

[anand]

Have you cleared cache?