Plugin NextGEN Gallery : Nothing found for this image

Recently i have encounter this problem when using this plugin. If i search for an image at google, and i click on the “see full size image”, it will display “Not Found-Sorry, but you are looking for something that isn’t here.”

In another way, if i copy the direct link, eg. mysite.com/wp-content/gallery/myphoto.jpg, it will display the same thing also, any solutions for this?