If you’re using the above combination, and you’re getting the above error, make sure that you’ve configured Paperclip to find ImageMagick in the right place.  Create an initializer file, RAILS_ROOT/config/intializers/paperclip.rb, and put “Paperclip.options[:image_magick_path] = ‘path/to/image_magic’” inside of it.  On Mac or a *nix system, type “which identify” to find the right folder.

Big thanks to avit on this forum for the solution.