Ruby on Rails - Postgres error when trying to start Rails Server - ruby-on-rails

Question

I am using:
ruby 2.2.1
rails 4.6.2
homebrew for postgres installation
rbenv
osx el capitan 10.11.5
Here is the error I receive when running:
rails s
/usr/local/lib/ruby/gems/2.2.0/gems/pg-0.18.4/lib/pg.rb:4:in `require': dlopen(/usr/local/lib/ruby/gems/2.2.0/gems/pg-0.18.4/lib/pg_ext.bundle, 9): Library not loaded: /usr/local/lib/libruby.2.2.0.dylib (LoadError)
Referenced from: /usr/local/lib/ruby/gems/2.2.0/gems/pg-0.18.4/lib/pg_ext.bundle
Reason: image not found - /usr/local/lib/ruby/gems/2.2.0/gems/pg-0.18.4/lib/pg_ext.bundle
from /usr/local/lib/ruby/gems/2.2.0/gems/pg-0.18.4/lib/pg.rb:4:in `<top (required)>'
from /usr/local/lib/ruby/gems/2.2.0/gems/bundler-1.12.5/lib/bundler/runtime.rb:86:in `require'
from /usr/local/lib/ruby/gems/2.2.0/gems/bundler-1.12.5/lib/bundler/runtime.rb:86:in `block (2 levels) in require'
from /usr/local/lib/ruby/gems/2.2.0/gems/bundler-1.12.5/lib/bundler/runtime.rb:81:in `each'
from /usr/local/lib/ruby/gems/2.2.0/gems/bundler-1.12.5/lib/bundler/runtime.rb:81:in `block in require'
from /usr/local/lib/ruby/gems/2.2.0/gems/bundler-1.12.5/lib/bundler/runtime.rb:70:in `each'
from /usr/local/lib/ruby/gems/2.2.0/gems/bundler-1.12.5/lib/bundler/runtime.rb:70:in `require'
from /usr/local/lib/ruby/gems/2.2.0/gems/bundler-1.12.5/lib/bundler.rb:102:in `require'
from /Users/jeffr/Dropbox/DevelopmentPC/rails4/myapp/config/application.rb:7:in `<top (required)>'
from /usr/local/lib/ruby/gems/2.2.0/gems/railties-4.2.6/lib/rails/commands/commands_tasks.rb:78:in `require'
from /usr/local/lib/ruby/gems/2.2.0/gems/railties-4.2.6/lib/rails/commands/commands_tasks.rb:78:in `block in server'
from /usr/local/lib/ruby/gems/2.2.0/gems/railties-4.2.6/lib/rails/commands/commands_tasks.rb:75:in `tap'
from /usr/local/lib/ruby/gems/2.2.0/gems/railties-4.2.6/lib/rails/commands/commands_tasks.rb:75:in `server'
from /usr/local/lib/ruby/gems/2.2.0/gems/railties-4.2.6/lib/rails/commands/commands_tasks.rb:39:in `run_command!'
from /usr/local/lib/ruby/gems/2.2.0/gems/railties-4.2.6/lib/rails/commands.rb:17:in `<top (required)>'
from /Users/jeffr/Dropbox/DevelopmentPC/rails4/myapp/bin/rails:9:in `require'
from /Users/jeffr/Dropbox/DevelopmentPC/rails4/myapp/bin/rails:9:in `<top (required)>'
from /usr/local/lib/ruby/gems/2.2.0/gems/spring-1.7.1/lib/spring/client/rails.rb:28:in `load'
from /usr/local/lib/ruby/gems/2.2.0/gems/spring-1.7.1/lib/spring/client/rails.rb:28:in `call'
from /usr/local/lib/ruby/gems/2.2.0/gems/spring-1.7.1/lib/spring/client/command.rb:7:in `call'
from /usr/local/lib/ruby/gems/2.2.0/gems/spring-1.7.1/lib/spring/client.rb:30:in `run'
from /usr/local/lib/ruby/gems/2.2.0/gems/spring-1.7.1/bin/spring:49:in `<top (required)>'
from /usr/local/lib/ruby/gems/2.2.0/gems/spring-1.7.1/lib/spring/binstub.rb:11:in `load'
from /usr/local/lib/ruby/gems/2.2.0/gems/spring-1.7.1/lib/spring/binstub.rb:11:in `<top (required)>'
from /usr/local/lib/ruby/site_ruby/2.2.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from /usr/local/lib/ruby/site_ruby/2.2.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from /Users/jeffr/Dropbox/DevelopmentPC/rails4/myapp/bin/spring:13:in `<top (required)>'
from bin/rails:3:in `load'
from bin/rails:3:in `<main>'

Answer 1

I ended up starting over with the entire rbenv, ruby and rails installation.
brew update
brew uninstall --force ruby
brew uninstall --force openssl
brew install openssl
brew link openssl --force
brew uninstall --force ruby-build
Then I followed this guide and it worked:
https://gorails.com/setup/osx/10.11-el-capitan
Except for the libxml2 error while installing rails:
libxml2 is missing. Please locate mkmf.log to investigate how it is failing.
I fixed that by running
$ gem install nokogiri -- --use-system-libraries [--with-xml2-config=/path/to/xml2-config] [--with-xslt-config=/path/to/xslt-config]