Your theme needs to be fixed for plugins to work. To fix your theme, use the Theme Editor to insert <?php wp_head(); ?> just before the </head> line of your theme’s header.php file.
Where do I need to put this exactly? I have a child theme. Does it go in the parent theme’s file?
Thanks for writing in! X has wp_head(); function added in the header. You may not find it the theme’s folder because we are using views. Please ignore the error message. The plugin should work without any issues at all. Would you mind if you tell us what plugin is giving this error?