error when trying to get setup

[joelcollinsdc]

I have code that matches exactly whats in the README and i get:

/Users/jcollins/.rvm/gems/ruby-2.3.3/gems/activeresource-2.3.5/lib/active_resource/base.rb:402:in `singleton class': undefined method `attr_accessor_with_default' for #<Class:ActiveResource::Base> (NoMethodError)
	from /Users/jcollins/.rvm/gems/ruby-2.3.3/gems/activeresource-2.3.5/lib/active_resource/base.rb:230:in `<class:Base>'
	from /Users/jcollins/.rvm/gems/ruby-2.3.3/gems/activeresource-2.3.5/lib/active_resource/base.rb:224:in `<module:ActiveResource>'
	from /Users/jcollins/.rvm/gems/ruby-2.3.3/gems/activeresource-2.3.5/lib/active_resource/base.rb:5:in `<top (required)>'
	from /Users/jcollins/.rvm/rubies/ruby-2.3.3/lib/ruby/site_ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
	from /Users/jcollins/.rvm/rubies/ruby-2.3.3/lib/ruby/site_ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
	from /Users/jcollins/.rvm/gems/ruby-2.3.3/gems/activeresource-2.3.5/lib/active_resource.rb:35:in `<top (required)>'
	from /Users/jcollins/.rvm/rubies/ruby-2.3.3/lib/ruby/site_ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
	from /Users/jcollins/.rvm/rubies/ruby-2.3.3/lib/ruby/site_ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
	from /Users/jcollins/.rvm/gems/ruby-2.3.3/gems/beanstalkapp-1.6.1/lib/beanstalkapp.rb:1:in `<top (required)>'
	from /Users/jcollins/.rvm/rubies/ruby-2.3.3/lib/ruby/site_ruby/2.3.0/rubygems/core_ext/kernel_require.rb:133:in `require'
	from /Users/jcollins/.rvm/rubies/ruby-2.3.3/lib/ruby/site_ruby/2.3.0/rubygems/core_ext/kernel_require.rb:133:in `rescue in require'
	from /Users/jcollins/.rvm/rubies/ruby-2.3.3/lib/ruby/site_ruby/2.3.0/rubygems/core_ext/kernel_require.rb:40:in `require'
	from ./test.rb:3:in `<main>'

This is ruby 2.3.3 as it says. Any ideas?