ruby error on rails s

rails_server.log

$ r s
dyld: lazy symbol binding failed: Symbol not found: _rb_data_object_alloc
  Referenced from: /Users/takuyan/dev/github/scrum/vendor/bundle/gems/nokogiri-1.6.6.2/lib/nokogiri/nokogiri.bundle
  Expected in: flat namespace

dyld: Symbol not found: _rb_data_object_alloc
  Referenced from: /Users/takuyan/dev/github/scrum/vendor/bundle/gems/nokogiri-1.6.6.2/lib/nokogiri/nokogiri.bundle
  Expected in: flat namespace

[1]    30819 trace trap  rails s

For fellow devs arriving here after searching for dyld: Symbol not found: _rb_data_object_alloc:

1. Check your ruby version ruby -v for the project you're trying to run is the one you intended.
2. You may want to create a .ruby-version file for rbenv/rvm in the project root to set the version. After creating .ruby-version, Check that ruby -v gives the version you expect.
3. Try whatever command (e.g. bundle exec rails s, bundle exec rspec) that gave the original error ensuring that it is run with the bundle deps (use bundle exec ...). Hopefully the error has gone.
4. If you still get the dyld: Symbol not found: _rb_data_object_alloc error, rebuild all the bundled gems with extensions from scratch for the current ruby version. This can be done by running bundle exec gem pristine inside the project root.

On my side, I also had to:

5. delete everything under vendor/bundle directory: rm -Rf vendor/bundle/*
6. run bundle install

yes, also for me, delete the .bundle dir and rebundle fixed it.