photoswipe.php:41

My Smartphone is showing this ” /wp-content/plugins/photoswipe-for-nextgen-gallery/ngg-photoswipe.php:41 ” at the top of the screen as an error when some one is trying to look at my site. I searched support and to be quite honest non of it made sense (my ignorance) . Can someone tell me how to get rid of this error warning. Obviously something to do with the Smartswipe plugin I have installed.