unable to upload*.... why ?

[JeanF]

******Adding DSC04973.JPG*****

Warning: chmod() [function.chmod]: No such file or directory in /home/v20craft/public_html/gallery/platform/fs_unix.php on line 36

Warning: getimagesize(/home/v20craft/public_html/gallery/albums/album195/DSC04973.jpg) [function.getimagesize]: failed to open stream: No such file or directory in /home/v20craft/public_html/gallery/lib/imageManipulation.php on line 592

Error: Invalid image: DSC04973.jpg
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This was the message when i tried to upload some pics after the second one. Why ?