Ruby 2.4 and Rails 4 stack level too deep (SystemStackError)

Question

I\'m trying to run newly created project in Rails 4.0.8 but I receive and error:

    rails s
=> Booting WEBrick
=> Rails 4.0.8 application starting in         


        

Answer 1

I have the same error, but I don't want to upgrade to 5.0, my app is very big and upgrate take too many time. I'm upgrading the Rails 4.1.7 to the Rails to 4.2.8 first Rails release with Ruby 2.4 support:

in the Gemfile:

gem 'rails', '4.2.8'

Then:

bundle update rails