Did you install Ghostscript in a path that contains special characters? And did you install that latest version?
Can you try to see if you get more information when you enable debugging? https://magick.codeplex.com/wikipage?title=Detailed%20debug%20information&referringTitle=Documentation
Can you try to see if you get more information when you enable debugging? https://magick.codeplex.com/wikipage?title=Detailed%20debug%20information&referringTitle=Documentation