Cannot locally serve jekyll using existing site

Question

I recently had to factory reset my computer. I redownloaded the repo for my Github Pages site, and reinstalled ruby, jekyll, and bundler following the Quickstart directions.

I am able to push new blog posts to my github repo without issue. However, I would also like to run the posts locally before publishing them. But when I run bundle exec jekyll serve I get the following output:

⠠⠵ bundle exec jekyll serve
/Users/adamg/.gem/ruby/3.1.3/gems/bundler-1.17.3/lib/bundler/shared_helpers.rb:29: warning: Pathname#untaint is deprecated and will be removed in Ruby 3.2.
/Users/adamg/.gem/ruby/3.1.3/gems/bundler-1.17.3/lib/bundler/shared_helpers.rb:118: warning: Pathname#untaint is deprecated and will be removed in Ruby 3.2.
/Users/adamg/.gem/ruby/3.1.3/gems/bundler-1.17.3/lib/bundler/shared_helpers.rb:118: warning: Pathname#untaint is deprecated and will be removed in Ruby 3.2.
/Users/adamg/.gem/ruby/3.1.3/gems/bundler-1.17.3/lib/bundler/shared_helpers.rb:35: warning: Pathname#untaint is deprecated and will be removed in Ruby 3.2.
/Users/adamg/.gem/ruby/3.1.3/gems/bundler-1.17.3/lib/bundler/shared_helpers.rb:35: warning: Pathname#untaint is deprecated and will be removed in Ruby 3.2.
/Users/adamg/.gem/ruby/3.1.3/gems/bundler-1.17.3/lib/bundler/shared_helpers.rb:44: warning: Pathname#untaint is deprecated and will be removed in Ruby 3.2.
/Users/adamg/.gem/ruby/3.1.3/gems/bundler-1.17.3/lib/bundler/shared_helpers.rb:118: warning: Pathname#untaint is deprecated and will be removed in Ruby 3.2.
bundler: failed to load command: jekyll (/Users/adamg/.gem/ruby/3.1.3/bin/jekyll)
LoadError: cannot load such file -- rexml/parsers/baseparser
  /Users/adamg/.gem/ruby/3.1.3/gems/kramdown-1.13.2/lib/kramdown/parser/html.rb:10:in `require'
  /Users/adamg/.gem/ruby/3.1.3/gems/kramdown-1.13.2/lib/kramdown/parser/html.rb:10:in `<top (required)>'
  /Users/adamg/.gem/ruby/3.1.3/gems/kramdown-1.13.2/lib/kramdown/parser/kramdown/html.rb:10:in `require'
  /Users/adamg/.gem/ruby/3.1.3/gems/kramdown-1.13.2/lib/kramdown/parser/kramdown/html.rb:10:in `<top (required)>'
  /Users/adamg/.gem/ruby/3.1.3/gems/kramdown-1.13.2/lib/kramdown/parser/kramdown/paragraph.rb:14:in `require'
  /Users/adamg/.gem/ruby/3.1.3/gems/kramdown-1.13.2/lib/kramdown/parser/kramdown/paragraph.rb:14:in `<top (required)>'
  /Users/adamg/.gem/ruby/3.1.3/gems/kramdown-1.13.2/lib/kramdown/parser/kramdown.rb:342:in `require'
  /Users/adamg/.gem/ruby/3.1.3/gems/kramdown-1.13.2/lib/kramdown/parser/kramdown.rb:342:in `<class:Kramdown>'
  /Users/adamg/.gem/ruby/3.1.3/gems/kramdown-1.13.2/lib/kramdown/parser/kramdown.rb:60:in `<module:Parser>'
  /Users/adamg/.gem/ruby/3.1.3/gems/kramdown-1.13.2/lib/kramdown/parser/kramdown.rb:19:in `<module:Kramdown>'
  /Users/adamg/.gem/ruby/3.1.3/gems/kramdown-1.13.2/lib/kramdown/parser/kramdown.rb:17:in `<top (required)>'
  /Users/adamg/.gem/ruby/3.1.3/gems/jekyll-3.5.2/lib/jekyll/converters/smartypants.rb:1:in `require'
  /Users/adamg/.gem/ruby/3.1.3/gems/jekyll-3.5.2/lib/jekyll/converters/smartypants.rb:1:in `<top (required)>'
  /Users/adamg/.gem/ruby/3.1.3/gems/jekyll-3.5.2/lib/jekyll.rb:11:in `require'
  /Users/adamg/.gem/ruby/3.1.3/gems/jekyll-3.5.2/lib/jekyll.rb:11:in `block in require_all'
  /Users/adamg/.gem/ruby/3.1.3/gems/jekyll-3.5.2/lib/jekyll.rb:10:in `each'
  /Users/adamg/.gem/ruby/3.1.3/gems/jekyll-3.5.2/lib/jekyll.rb:10:in `require_all'
  /Users/adamg/.gem/ruby/3.1.3/gems/jekyll-3.5.2/lib/jekyll.rb:186:in `<top (required)>'
  /Users/adamg/.gem/ruby/3.1.3/gems/jekyll-3.5.2/exe/jekyll:6:in `require'
  /Users/adamg/.gem/ruby/3.1.3/gems/jekyll-3.5.2/exe/jekyll:6:in `<top (required)>'
  /Users/adamg/.gem/ruby/3.1.3/bin/jekyll:25:in `load'
  /Users/adamg/.gem/ruby/3.1.3/bin/jekyll:25:in `<top (required)>'

I have added webrick, so I don't believe that is the issue. I also didn't run a jekyll new [myblog] during the setup since I already have a blog. I am thinking that maybe there is a clash between my pre-existing files and the newly install ruby and jekyll, but I'm not sure how to check. Here is my Gemfile. Do I need to modify this? I also tried removing the version number from webrick.:

source 'https://rubygems.org'

gem "github-pages", '163', group: :jekyll_plugins

# enable tzinfo-data for local build
# gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw]
gem 'jekyll-paginate'

# gem "webrick", "~> 1.8"
gem "webrick"