Cannot run github pages locally - jekyll

Question

I'm trying to run a basic GitHub page locally on macOS.
Here is my Gemfile:
$cat Gemfile
source 'https://rubygems.org'
gem 'github-pages', group: :jekyll_plugins
Then I install the dependencies:
$bundle install --path vendor/bundle
As a result, it installs Jekyll 3.8.5.
But when I build the site with bundle exec jekyll build --verbose I get the next error:
Logging at level: debug
Configuration file: /Users/user/personal/my_user_name.github.io/_config.yml
Theme: jekyll-theme-midnight
Theme source: /Users/user/personal/my_user_name.github.io/vendor/bundle/ruby/2.6.0/gems/jekyll-theme-midnight-0.1.1
Invalid theme folder: _includes
GitHub Pages: github-pages v203
GitHub Pages: jekyll v3.8.5
Theme: jekyll-theme-midnight
Theme source: /Users/user/personal/my_user_name.github.io/vendor/bundle/ruby/2.6.0/gems/jekyll-theme-midnight-0.1.1
Invalid theme folder: _includes
Requiring: jekyll-seo-tag
Requiring: jekyll-coffeescript
Requiring: jekyll-commonmark-ghpages
Requiring: jekyll-gist
jekyll 3.8.5 | Error: uninitialized constant Faraday::Error::ClientError
Did you mean? Faraday::ClientError
My machine details:
$sw_vers
ProductName: Mac OS X
ProductVersion: 10.15.2
BuildVersion: 19C57
How can I fix the issue?
P.S.
If I create a jekyll directory from scratch with
$jekyll new myblog
$cd myblog
$jekyll serve
It runs correctly. The only difference I see is that it uses Jekyll 4.0.0
UPDATE:
I have changed the Gemfile to this:
$cat Gemfile
source 'https://rubygems.org'
#gem 'github-pages', group: :jekyll_plugins
gem 'github-pages'
After I run bundle exec jekyll serve --verbose I see:
Logging at level: debug
Configuration file: /Users/user/personal/my_user_name.github.io/_config.yml
Logging at level: debug
Theme: jekyll-theme-midnight
Theme source: /Users/user/personal/my_user_name.github.io/vendor/bundle/ruby/2.6.0/gems/jekyll-theme-midnight-0.1.1
Invalid theme folder: _includes
Requiring: jekyll-seo-tag
Source: /Users/user/personal/my_user_name.github.io
Destination: /Users/user/personal/my_user_name.github.io/_site
Incremental build: disabled. Enable with --incremental
Generating...
EntryFilter: excluded /Gemfile
EntryFilter: excluded /Gemfile.lock
EntryFilter: excluded /vendor/bundle/ruby
Rendering: assets/css/style.scss
Pre-Render Hooks: assets/css/style.scss
Rendering Markup: assets/css/style.scss
Writing: /Users/user/personal/my_user_name.github.io/_site/assets/css/style.css
done in 0.099 seconds.
Requiring: jekyll-watch
Watcher: Ignoring (?-mix:^_config\.yml)
Watcher: Ignoring (?-mix:^_site\/)
Watcher: Ignoring (?-mix:^Gemfile)
Watcher: Ignoring (?-mix:^Gemfile\.lock)
Watcher: Ignoring (?-mix:^vendor\/bundle\/)
Auto-regeneration: enabled for '/Users/user/personal/my_user_name.github.io'
[2020-01-01 17:52:58] INFO WEBrick 1.4.2
[2020-01-01 17:52:58] INFO ruby 2.6.5 (2019-10-01) [x86_64-darwin19]
[2020-01-01 17:52:58] DEBUG WEBrick::HTTPServlet::FileHandler is mounted on /.
[2020-01-01 17:52:58] DEBUG unmount .
[2020-01-01 17:52:58] DEBUG Jekyll::Commands::Serve::Servlet is mounted on .
Server address: http://127.0.0.1:4000
[2020-01-01 17:52:58] INFO WEBrick::HTTPServer#start: pid=65841 port=4000
Server running... press ctrl-c to stop.
[2020-01-01 17:53:27] DEBUG accept: 127.0.0.1:53546
[2020-01-01 17:53:27] DEBUG accept: 127.0.0.1:53547
[2020-01-01 17:53:27] DEBUG Jekyll::Commands::Serve::Servlet is invoked.
[2020-01-01 17:53:30] DEBUG Jekyll::Commands::Serve::Servlet is invoked.
[2020-01-01 17:53:31] DEBUG Jekyll::Commands::Serve::Servlet is invoked.
[2020-01-01 17:53:34] DEBUG Jekyll::Commands::Serve::Servlet is invoked.
[2020-01-01 17:53:35] DEBUG Jekyll::Commands::Serve::Servlet is invoked.
[2020-01-01 17:53:42] DEBUG close: 127.0.0.1:53547
^C[2020-01-01 17:53:55] DEBUG close TCPSocket(127.0.0.1, 4000)
[2020-01-01 17:53:55] INFO going to shutdown ...
[2020-01-01 17:53:56] DEBUG close: 127.0.0.1:53546
[2020-01-01 17:53:56] INFO WEBrick::HTTPServer#start done.
But when I open it in browser I see just a list of directories but not the blog

Answer 1

It looks due to the latest update of faraday - a gem depended by github-pages.
Try this workaround temporarily.
Add the following line to your Gemfile.
gem 'faraday', '~> 0'
Use command bundle update to update the gem(s) with Gemfile.
You may see outputs below:
Fetching faraday 0.17.3 (was 1.0.0)
Installing faraday 0.17.3 (was 1.0.0)
That means gem faraday in ./vendor/bundle has been updated to the latest compatible version with the github-pages.
You can check the version history of faraday at this page on rubygems.org.
Try bundle exec jekyll again.
If it doesn't work yet, try bundle pristine.