Ruby installation missing psych? (For YAML output) Someone tell me what this means and how to fix?

/Users/DavidRyan/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/bundler-1.9.6/lib/bundler/shared_helpers.rb:78: warning: Insecure world writable dir /usr/local in PATH, mode 040777 /Users/DavidRyan/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/bundler-1.9.6/lib/bundler/shared_helpers.rb:78: warning: Insecure world writable dir /usr/local in PATH, mode 040777

• bin/rake: spring already present
• bin/rails: spring inserted Davids-MacBook-Pro:~ DavidRyan$ clear

Davids-MacBook-Pro:~ DavidRyan$ cd testapp Davids-MacBook-Pro:testapp DavidRyan$ bin/rails server /Users/DavidRyan/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/bundler-1.9.6/lib/bundler/shared_helpers.rb:78: warning: Insecure world writable dir /usr/local in PATH, mode 040777 /Users/DavidRyan/.rbenv/versions/2.2.2/lib/ruby/2.2.0/yaml.rb:4:in `<top (required)>': It seems your ruby installation is missing psych (for YAML output). To eliminate this warning, please install libyaml and reinstall your ruby. bin/rails:6: warning: already initialized constant APP_PATH /Users/DavidRyan/testapp/bin/rails:6: warning: previous definition of APP_PATH was here Usage: rails COMMAND [ARGS]

The most common rails commands are: generate Generate new code (short-cut alias: "g") console Start the Rails console (short-cut alias: "c") server Start the Rails server (short-cut alias: "s") dbconsole Start a console for the database specified in config/database.yml (short-cut alias: "db") new Create a new Rails application. "rails new my_app" creates a new application called MyApp in "./my_app"

In addition to those, there are: destroy Undo code generated with "generate" (short-cut alias: "d") plugin new Generates skeleton for developing a Rails plugin runner Run a piece of code in the application environment (short-cut alias: "r") Jason Seifer