NextGen Gallary: Uploaded, but not showing

When I upload images, it shows images successfully uploaded. But along with that, it shows this error:

http://farm4.static.flickr.com/3318/3663263013_e738d016ef.jpg

When I add this gallary to the post, images does not show, only blank thumbnails. But when I click on that, image shows. check this:

http://amrita-rao.in/latest-pictures/amrita-rao-some-latest-stills/