Constant error messages

We get this error all the time. Here is a sample:

https://photoimpr.com/client-photo-galleries/gallery/lexie-sperlbaub-senior-pictures-ann-arbor-pioneer-hs-island-park-outdoor-photography/
Error message at top: Warning: getimagesize(/home/photoimp/public_html/wp-content/uploads/sunshine/11830/2016-08-31-web001-Lexie-Sperlbaub-Senior-Picture-Ann-Arbor-Portrait-Photography-214×300.jpg): failed to open stream: No such file or directory in /home/photoimp/public_html/wp-content/plugins/sunshine-photo-cart/classes/frontend.class.php on line 510

Where do I start with this?

Kerry