miniMagick identify error in rails_admin app: Failed to manipulate with MiniMagick, maybe it is not an image?

Question

I am using carrierwave and mini_magick gems to use images inside rails_admin. When I upload an image it fails with this error:

Failed to manipulate with MiniMagick, maybe it is not an image? 
Original Error: `identify C:/Users/Zeke/AppData/Local/Temp/mini_magick20161027-21132-xdongz.png` failed with error: 
    identify.exe: RegistryKeyLookupFailed `CoderModulesPath' @ error/module.c/GetMagickModulePath/662. 
    identify.exe: no decode delegate for this image format `PNG' @ error/constitute.c/ReadImage/501.

And this doesn't happen when I don't include the following lines in my uploader.rb

  # Process files as they are uploaded:
  process resize_to_fit: [800, 600]

  # Create different versions of your uploaded files:
  version :thumb do
    process resize_to_fill: [40, 30]
  end

I require thumbnails, and how do I do it?

---

Here's What I'm sure of:

• ImageMagick has been installed and is working for sure. I am able to convert png to jpg and jpg to png, identify images...
• identify C:/Users/Zeke/AppData/Local/Temp/mini_magick20161027-21132-xdongz.png executes successfully when run in cmd (without admin priv, if that matters)

• identify -list format gives a huuuuge list that almost contains every image format I can think of. And yes, it includes JPG, JPEG, PNG and all that I need.

• convert -version does include jpeg png delegates

What am I doing wrong?

Answer 1

Both identify and convert I tested were working fine except for the fact that they were not actually used by rails, which used another installation of imagemagick which was very old and threw this translation missing error at first which I managed to solve by adding a few lines in en.yml

It is notable that System Environment Variables can be overridden by set path that only lasts long for that instance of cmd

Making rails use the new version of ImageMagick solved the problem. Credits: Mark Setchell