Slides Not Uploading

When I try to upload new slides to the slideshow the following error flashes for a moment and then disappears before returning me to the regular page. The "slide" is created but the image is not there. See the last slides here for example: http://uniimi.com/coxsoncreativearts

Warning: imagecreatetruecolor() [function.imagecreatetruecolor]: Invalid image dimensions in /nfs/c09/h03/mnt/134562/domains/uniimi.com/html/wp-content/themes/gallery/library/functions/option-functions.php on line 2019

Warning: imagecopyresampled(): supplied argument is not a valid Image resource in /nfs/c09/h03/mnt/134562/domains/uniimi.com/html/wp-content/themes/gallery/library/functions/option-functions.php on line 2036

Warning: imagejpeg(): supplied argument is not a valid Image resource in /nfs/c09/h03/mnt/134562/domains/uniimi.com/html/wp-content/themes/gallery/library/functions/option-functions.php on line 2045

Warning: chmod() [function.chmod]: No such file or directory in /nfs/c09/h03/mnt/134562/domains/uniimi.com/html/wp-content/themes/gallery/library/functions/option-functions.php on line 2053