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in `require': no such file to load -- watir (LoadError)
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   require 'watir'
   test_site = 'http://www.advidea.cn/'
 
   # open the IE browser
   ie = Watir::IE.new
   # print some comments
   puts "## Beginning of test: advidea"
   puts "  "
 
   puts "Step 1: go to the test site: " + test_site
   ie.goto(test_site)
   puts "  Action: entered " + test_site + " in the address bar."
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