"In Mundana’s newly created directory bundle" operation does not work

[psomdeb25]

In a terminal I went into the directory (/mundana-theme-jekyll) and then typed the following code:
bundle install

The bundle installs and fetches several gems but when it encounters eventmachine the entire operation stops and shows me the following error.

An error occurred while installing eventmachine (1.2.7), and Bundler cannot continue. Make sure that gem install eventmachine -v '1.2.7' --source 'https://rubygems.org/' succeeds before bundling.

I followed the instruction to install the gem but I get the error again. Is this a bug or is there a solution to this? I would like to use this Jekyll theme for my blog.

Ruby version: ruby 3.0.0p0
macOS version: 12.0.1

Edit: @canaryGrapher @clerissonmn

[wangyunzi]

I had this problem，have you solved it？？