I've been trying to post some photos to the Photo Gallery, and get the following message several seconds after clicking the "Upload" button.

Error creating thumbnail! Error code: 1

Command:

"/usr/bin/mogrify" +profile "*" -size 100x66 -quality 70 -geometry 100x66 -unsharp 10 '/home/gallery/public_html/data/509/thumbs/DSC_00142.jpg'

Thanks,
Louis