$ bundle install
Bundler could not find compatible versions for gem "railties":
In Gemfile:
coffee-rails (~> 4.1.0) was resolved to 4.1.0, which depends on
railties (< 5.0, >= 4.0.0)
rails (~> 5.2.7) was resolved to 5.2.7, which depends on
railties (= 5.2.7)
Solution:
Update the existing coffee-rails, for example, edit the Gemfilegem 'coffee-rails', '~> 4.2'
sudo gem* 