ReferenceError: gvGlobals is not defined
wp_footer() function on its footer.php file.
If that's the case, then you'll need to edit that file using the theme editor inside your WordPress website and add that function:
If your theme already has the call to the wp_footer() function and you are still seeing that error message on the Browser console, then you must add this line of code before it:
Here's what it'll look like: