I had the same problem, and found the solution here:

https://github.com/jm/rails_upgrade/issues#issue/7/comment/497475

There's a required gem that uses fork(), of which there is a windows
version that doesn't. So first, you have to...

gem install win32-open3

...and then you edit the file as stated in the link, I quote:

edit vendor\plugins\rails_upgrade\lib\application_checker.rb and
change:
require 'open3'
to
require 'win32/open3'

Cheers,
Guido

On Oct 27, 7:50 pm, Marc Bungart <[email protected]> wrote:
> Hi daze,
>
> I’m trying the same without a solution yet. Did you make any progress?
>
> Kind regards
> Marc
>
> --
> Posted viahttp://www.ruby-forum.com/.

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