ruby - NameError: uninitialized constant MongoClient -

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i'm using ruby 2.2. have installed mongo gem, still error:

my-mac:ruby-2.2.0 me$ gem list  *** local gems ***  bigdecimal (1.2.6) bson (4.0.3) bundler (1.10.6) bundler-unload (1.0.2) executable-hooks (1.3.2) gem-wrappers (1.2.7) io-console (0.4.3) json (1.8.1) log4r (1.1.10) mini_portile2 (2.0.0) minitest (5.4.3) mongo (2.2.3) nokogiri (1.6.7.2) power_assert (0.2.2) psych (2.0.8) rake (10.4.2) rdoc (4.2.0) rubygems-bundler (1.4.4) rvm (1.11.3.9) test-unit (3.0.8) my-mac:ruby-2.2.0 me$ irb 2.2.0 :001 > require 'mongo'  => true 2.2.0 :002 > include mongo  => object 2.2.0 :003 > mongo::version  => "2.2.3" 2.2.0 :004 > c = mongoclient.new nameerror: uninitialized constant mongoclient     (irb):4     /users/me/.rvm/rubies/ruby-2.2.0/bin/irb:11:in `<main>' 2.2.0 :005 >

what's problem?

the object want instantiate mongo::client.new

docs here.


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