I realized this was only happening in development.  I started comparing the 
two environments...I removed everything from development.rb and started 
putting things back until the error showed up.  This led me to learn that 
the issue originated in the bullet gem...and, they have an update from 2 
days ago.  Boooya.   

updating bullet to 5.7.1 fixed this

On Wednesday, January 17, 2018 at 11:53:25 AM UTC-8, Adam Stockland wrote:
>
> I've upgraded to rails 5.2 and am implementing ActiveStorage. 
>  ActiveStorage uses mutool for PDF processing.  I have successfully 
> installed mutool locally using homebrew.
>
>     mutool is a bit confusing.  
>     
>     rails docs claim to require "mutool", 
>     homebrew installs "mupdf-tools", 
>     and heroku wants "mupdf".
>
> I have successfully installed apt and mupdf on heroku following these 
> steps:
>
>     - add a new Aptfile to the root of my application with only "mupdf" 
> listed
>     - commit and push the Aptfile
>     - THEN run heroku buildpacks:add --index 1 
> https://github.com/heroku/heroku-buildpack-apt
>     - push again so heroku will finish installing apt and mupdf
>    
> mupdf builds successful during the push
>     
>     heroku buildpacks now returns    
>     1. https://github.com/heroku/heroku-buildpack-apt
>     2. heroku/ruby
>
> If I refresh a page calling for a variant on a PDF, the image fails to 
> process and the job kicks back the following error:
>
>       Errno::ENOENT: No such file or directory - mutool
>
> It seems mutool and mupdf are synonomous...so, I tried swapping out mutool 
> for mupdf in my Aptfile...that failed to build from "...not found'.
>
> Anyone know what action I need to take?
>
> PS:  This is part of implementing rails 5.2 using ActiveStorage.
>
> # UPDATE
>
> I added mupdf-tools to Aptfile and that seems to fix the "no such file or 
> directory" error.  I don't know for sure because a new errors surfaces
>
>     MiniMagick::Invalid: `identify /tmp/mini_magick20180105-4-pvub9r` 
> failed with error: identify.im6: no decode delegate for this image format 
> `/tmp/mini_magick20180105-4-pvub9r' @ error/constitute.c/ReadImage/544.
>
>     MiniMagick::Error: `identify -format %m %w %h %b 
> /tmp/ActiveStorage20180105-4-1f46tem[0]` failed with error: identify.im6: 
> no decode delegate for this image format 
> `/tmp/ActiveStorage20180105-4-1f46tem' @ error/constitute.c/ReadImage/544.
>

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