[wtr-general] require 'watir-webdiver' failing with 'can't activate ffi'

[Rick]

Any idea  what i am doing wrong?  Overview.rb line 3 has - require
"watir-webdriver".

Thanks in advance

$ ./Overview.rb
/usr/lib/ruby/1.9.1/rubygems.rb:238:in `activate': can't activate ffi
(= 1.0.9, runtime) for ["selenium-webdriver-2.10.0", "watir-
webdriver-0.3.5"], already activated ffi-1.0.10 for
["childprocess-0.2.2", "selenium-webdriver-2.10.0", "watir-
webdriver-0.3.5"] (Gem::LoadError)
        from /usr/lib/ruby/1.9.1/rubygems.rb:254:in `block in activate'
        from /usr/lib/ruby/1.9.1/rubygems.rb:253:in `each'
        from /usr/lib/ruby/1.9.1/rubygems.rb:253:in `activate'
        from /usr/lib/ruby/1.9.1/rubygems.rb:254:in `block in activate'
        from /usr/lib/ruby/1.9.1/rubygems.rb:253:in `each'
        from /usr/lib/ruby/1.9.1/rubygems.rb:253:in `activate'
        from /usr/lib/ruby/1.9.1/rubygems.rb:1119:in `try_activate'
        from <internal:gem_prelude>:218:in `try_activate'
        from <internal:lib/rubygems/custom_require>:32:in `rescue in require'
        from <internal:lib/rubygems/custom_require>:29:in `require'
        from ./Overview.rb:3:in `<main>'

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