Cannot execute "rails console" due to an error with readline
I had the same issue recently with homebrew and libreadline.7.x.dylib / libreadline.6.x.dylib
I solved it by running:
ln -s /usr/local/opt/readline/lib/libreadline.7.0.dylib /usr/local/opt/readline/lib/libreadline.6.dylib
Homebrew is great, but once in a while it doesn't play nice with some of the other moving parts.
A brew update && brew upgrade brought in libreadline.7.x.dylib while automatically removing libreadline.6.x.dylib, which ruby was still relying on.
There may be more clever ways to fix the problem, but brute force worked for me:
$ rbenv uninstall 2.3.1$ rbenv install 2.3.1$ cd /path/to/my/app$ bundleThe above assumes the presence of rbenv's ruby-build and, of course, bundler; replace 2.3.1 with whatever version of ruby you are using.
Please note that similar problems can occur with different homebrew-managed libraries (see my own answer to this, for example)
I'm on OSX, ruby2.3.0, rails5. Adding gem 'rb-readline' to my Gemfile fixed this problem.