You received an error upon command bundle install similar to the one below:
/.../ruby/bin/bundle:25:in `load': cannot load such file -- /.../ruby/gems/3.1.0/gems/bundler-2.3.11/exe/bundle (LoadError)
from /.../ruby/bin/bundle:25:in `<main>'
This post might explain you how to fix it.
Don’t install gems with sudo
This is actually a prerequisite, but I will still mention it. You don’t want your gems to be installed by a super user. First, it causes problems, and second, it is not safe. I am trying to use most of my programs without sudo and it usually works out.
There is a number of ways to install Ruby without sudo, e.g. you can use Homebrew on macOS:
$ brew install ruby
Note that you must first install Homebrew.
Fill out the missing version
The error happens when you install a bundle that is linked to a bundler version that was removed (e.g. updated).
The easiest way to fix this is to install the specific version of bundler that is missing:
$ gem install bundler -v 2.3.11
Then you can run bundle install and it should run without the error:
$ bundle install
Bundle complete! 2 Gemfile dependencies, 102 gems now installed.
Use `bundle info [gemname]` to see where a bundled gem is installed.
Afterwards you can even remove the old version as the bundle will now use the latest one you have:
$ gem uninstall bundler -v 2.3.11