[WP Smush Pro] Smush Pro Fatal Error when activating

Hi there,

When trying to activate Smush Pro, I get this error message: Warning: require_once(public_html/wp-content/plugins/wp-smushit/lib/class-wp-smush-rest.php): failed to open stream: No such file or directory in public_html/wp-content/plugins/wp-smush-pro/lib/class-wp-smush.php on line 37 Fatal error: require_once(): Failed opening required 'public_html/wp-content/plugins/wp-smushit/lib/class-wp-smush-rest.php' (include_path='.:disappointed:usr/share/pear54:disappointed:usr/share/php') in public_html/wp-content/plugins/wp-smush-pro/lib/class-wp-smush.php on line 37.

Could you please advise how to solve this. I've deleted and reinstalled the plugin and still getting the same error message.

I've granted support access to look into the site.

Many thanks,
Jon