Ruby on Rails incompatible library

Question

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

Answer 1

Something's gotten weird/corrupted in your ruby environment. I'd blame rvm. Personally I am not a fan of rvm.

But you might try gem uninstall json, follow prompts to uninstall ALL versions. Then bundle install again. Then hopefully you'll be fixed up.

Answer 2

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.

Answer 3

It looks like a never version of json gem is already present and being picked up by rails. You could either remove the version manually:

gem uninstall json -v 1.8.2

or, since you're using RVM already, create a gemset specific to this project.