You have already activated rack 1.6.0, but your Gemfile requires rack 1.6.4

Question

Similar to problem with rack 1.3.2. You have already activated rack 1.3.2, but your Gemfile requires rack 1.2.3 -- I\'m experiencing You have already activated rack 1.6.0,

Answer 1

Run it like this: bundle exec rails s. This will use settings from your Gemfile.lock