node_images.module on line 567

* warning: getimagesize(files/15005471_92.jpg) [function.getimagesize]: failed to open stream: No such file or directory in /home/chibabea/wwwroot/chibabeat.com/modules/node_images/node_images.module on line 567.
* warning: getimagesize(files/13471840_152.jpg) [function.getimagesize]: failed to open stream: No such file or directory in /home/chibabea/wwwroot/chibabeat.com/modules/node_images/node_images.module on line 567.

I keep getting this error on a teaser list view where the teaser was made with cck/contemplate. The teaser images are imagecache (not node images) so I am not sure why I am getting this error. Any ideas on what is causing the problem?