Cannot Open Rails console without getting circular argument warning -


whenever type in rails console terminal (i'm in root of program), this:

/users/turnipz/.rvm/gems/ruby-2.2.1/gems/activesupport-3.2.13/lib/active_support/values/time_zone.rb:270: warning: circular argument reference - /users/turnipz/.rvm/gems/ruby-2.2.1/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:251:in `require': cannot load such file -- test/unit/testcase (loaderror) /users/turnipz/.rvm/gems/ruby-2.2.1/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:251:in `block in require' /users/turnipz/.rvm/gems/ruby-2.2.1/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:236:in `load_dependency' /users/turnipz/.rvm/gems/ruby-2.2.1/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:251:in `require' /users/turnipz/.rvm/gems/ruby-2.2.1/gems/activesupport-3.2.13/lib/active_support/test_case.rb:1:in `<top (required)>' /users/turnipz/.rvm/gems/ruby-2.2.1/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:251:in `require' /users/turnipz/.rvm/gems/ruby-2.2.1/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:251:in `block in require' /users/turnipz/.rvm/gems/ruby-2.2.1/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:236:in `load_dependency' /users/turnipz/.rvm/gems/ruby-2.2.1/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:251:in `require' /users/turnipz/.rvm/gems/ruby-2.2.1/gems/railties-3.2.13/lib/rails/console/app.rb:2:in `<top (required)>' /users/turnipz/.rvm/gems/ruby-2.2.1/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:251:in `require' /users/turnipz/.rvm/gems/ruby-2.2.1/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:251:in `block in require' /users/turnipz/.rvm/gems/ruby-2.2.1/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:236:in `load_dependency' /users/turnipz/.rvm/gems/ruby-2.2.1/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:251:in `require' /users/turnipz/.rvm/gems/ruby-2.2.1/gems/railties-3.2.13/lib/rails/application.rb:304:in `initialize_console' /users/turnipz/.rvm/gems/ruby-2.2.1/gems/railties-3.2.13/lib/rails/application.rb:152:in `load_console' /users/turnipz/.rvm/gems/ruby-2.2.1/gems/railties-3.2.13/lib/rails/commands/console.rb:27:in `start' /users/turnipz/.rvm/gems/ruby-2.2.1/gems/railties-3.2.13/lib/rails/commands/console.rb:8:in `start' /users/turnipz/.rvm/gems/ruby-2.2.1/gems/railties-3.2.13/lib/rails/commands.rb:41:in `<top (required)>' script/rails:6:in `require' script/rails:6:in `<main>'

how rid of , able use rails console? think has https://teamtreehouse.com/forum/rails-console-not-fully-loading. i'm complete beginner, i'll need step step guide fixing problem. how add 

gem 'test unit'

to gemfile.


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