Getting following error.

public_html/wp-content/plugins/wpoptin/admin/class-wpoptins.php on line 338

Hello,

The plugin is great so far & exactly what I was looking for, but how do I change the visibility so that it’s visible at the very top of my pages, but is not sticky as the user scrolls?

I would only like it visible when the user is at the top of the page as an announcement bar.

Thanks!