It isn't invalid for me and you can change it to test if you'd like. Did you check the directory for the file?
If you continue to have problems, please post a link.
http://forum.coppermine-gallery.net/index.php/topic,55415.msg270616.html#msg270616
If you continue to have problems, please post a link.
http://forum.coppermine-gallery.net/index.php/topic,55415.msg270616.html#msg270616