ERROR: Image conversion failed. /usr/bin/convert  -resize "504x504" -density "72x72" -quality "50" "/var/www/scaa/persuasion/master_images/jpegs/1926-p01.jpg" jpeg:"/var/www/scaa/sain/cache/_1926-p01.jpg_resize:504x504_density:72x72_quality:50_type:jpeg"