ruby – 没有这样的文件加载 – ffi_c(LoadError)

require "rubygems"
require "watir"

browser = Watir::Browser::new
browser.bring_to_front

我得到这个错误：

(...)rubygems/custom_require.rb:36:in `require': no such file to load -- ffi_c (LoadError)

我尝试卸载并重新安装ffi / watir / ruby?? / netbeans没有成功.

第36行在custom_require.rb中

def require path
if Gem.unresolved_deps.empty? or Gem.loaded_path? path then
  gem_original_require path
else
  spec = Gem.searcher.find_active path
  unless spec then
    found_specs = Gem.searcher.find_in_unresolved path
    unless found_specs.empty? then
      found_specs = [found_specs.last]
    else
      found_specs = Gem.searcher.find_in_unresolved_tree path
    end
    found_specs.each do |found_spec|
      Gem.activate_spec found_spec
    end
  end
  return gem_original_require path #problem
end

*本地GEMS *

archive-tar-minitar (0.5.2)
builder (3.0.0)
childprocess (0.2.2)
columnize (0.3.4)
commonwatir (2.0.4)
ffi (1.0.10 x86-mingw32)
firewatir (1.9.4,1.8.1)
hoe (2.12.3,2.8.0)
json (1.6.1)
json_pure (1.6.1)
linecache19 (0.5.12)
minitest (2.7.0,2.6.2,1.6.0)
nokogiri (1.5.0 x86-mingw32)
rake (0.9.2.2,0.9.2,0.8.7)
rautomation (0.6.3)
rdiscount (1.6.8)
rdoc (3.11,2.5.8)
require_all (1.2.0)
ruby-debug-base19 (0.11.25)
ruby-debug-ide (0.4.16,0.4.9)
ruby_core_source (0.1.5)
rubyzip (0.9.4)
s4t-utils (1.0.4)
selenium-webdriver (2.10.0)
user-choices (1.1.6.1)
watir (2.0.4)
watir-webdriver (0.3.5)
win32-api (1.4.8 x86-mingw32)
win32-process (0.6.5)
windows-api (0.4.0)
windows-pr (1.2.1)
xml-simple (1.1.1,1.1.0)