ruby - Can't find mechanize gem error require -

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so i've been using mechanize gem fine on osx machine when i'm trying use on win10 machine i've run issues. can't find mechanize gem reason. c:/ruby21-x64/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in require': cannot load such file -- mechanize (loaderror)

are able use other gems on win10 machine without error?

it looks error nokogiri not mechanize. version of nokogiri have installed?

i try updating gems gem update --system


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