I\'ve just started to have a look at ruby on rails and can\'t get a server to run. I\'m running ruby 2.3.0 and rails 4.2.5 and after I have a new rail projects I try to run
I had a similar problem to what you described after I had taken a different ruby version into use (from 2.3.0 -> 2.3.3).
I found that running:
$ gem install bundler
Then:
$ bundle install
... worked a charm for me. This reinstalled all of the packages I needed in my Gemfile without any dependency issues.