Undefined method 'rewind' - pages cannot be added about jekyll-admin

[vcavallo]

I set up jekyll-admin on one machine and everything worked fine (including page creation and editing).
Cloned to another machine and ran it there - all the pages are there, but the jekyll-admin interface reports "could not fetch config" and can't update or create any posts.

here's a small snippet of the error output in the terminal:

/home/vcavallo/.rbenv/versions/3.2.2/lib/ruby/gems/3.2.0/gems/rackup-2.1.0/lib/rackup/handler/webrick.rb:66 (created)>>:

                request.body.rewind
                            ^^^^^^^
        /home/vcavallo/.rbenv/versions/3.2.2/lib/ruby/gems/3.2.0/gems/jekyll-admin-0.11.1/lib/jekyll-admin/server.rb:84:in `request_body'

[yuanworks]

I managed to get it working by downgrading sinatra in the gemfile:

gem "sinatra", ">= 3", "< 4"