Когда мы добавляем ведомое устройство нашего соединения, мы делаем следующее:
I stumbled upon this question because I had the same issue. This is how I fixed it:
Run a simple GM command to find out the problem:
gm convert -size 120x120 randomimage.jpg -resize 120x120 thumbnail.jpg
Mine was that GM wasn't configured to support JPGs. I just removed all the GM files from usr/local and ran:
sudo yum install GraphicsMagick GraphicsMagick-devel
After this everything worked as supposed.