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我是 ruby​​ 及其 pdf-extract gem 的新手。在为 64 位安装了 ruby​​ 并安装了相关的开发工具包之后，我已经安装了 pdf-extract，代码如下：

gem install pdf-extract

通过查看来自网站https://github.com/CrossRef/pdfextract的快速示例，

我努力了

pdf-extract 提取--references C:/dnm1.pdf

执行上面的代码时，出现如下错误：

C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/commander-4.2.0/lib/commander/runner.rb: 384:in block in require_program': program version required (Commander::Runner:: CommandError) from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/commander-4.2.0/lib/command er/runner.rb:383:ineach' 来自 C:/Ruby200-x64/lib/ruby/ gems/2.0.0/gems/commander-4.2.0/lib/command er/runner.rb:383:in require_program' from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/commander-4.2.0/lib/command er/runner.rb:51:inrun！来自 C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/commander-4.2.0/lib/command er/delegates.rb:8:inrun!' from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/commander-4.2.0/lib/command er/import.rb:10:in块中的' C:/Ruby200-x64/lib/ ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in require ': 126: The specified module could not be found. - C:/Ruby200-x64/lib/ruby/gem s/2.0.0/gems/libsvm-ruby-swig-0.4.0/ext/libsvm.so (LoadError) from C:/Ruby200-x64/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:5 5:inrequire' 来自 C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/libsvm-ruby-swig-0.4.0/lib /svm.rb:1:in <top (required)>' from C:/Ruby200-x64/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:5 5:inrequire' 来自 C:/Ruby200-x64/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:5 5:in require' from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/pdf-extract-0.1.1/lib/refer ences/score.rb:1:in'来自 C:/Ruby200-x64/lib/ruby /gems/2.0.0/gems/pdf-extract-0.1.1/lib/references/references.rb:3:inrequire_relative' from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/pdf-extract-0.1.1/lib/refer ences/references.rb:3:in' 来自 C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/pdf-extract-0.1.1/lib/pdf-e xtract.rb:10:in require_relative' from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/pdf-extract-0.1.1/lib/pdf-e xtract.rb:10:in' 来自 C:/Ruby200-x64/ lib/ruby/gems/2.0.0/gems/pdf-extract-0.1.1/bin/pdf-e xtract:5:in require_relative' from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/pdf-extract-0.1.1/bin/pdf-e xtract:5:in'

从 C:/Ruby200-x64/bin/pdf-extract:23:in 从 C:/Ruby200-x64/bin/pdf-extract:23:in 加载

我已经通过网络检查了与 pdf-extract 相关的问题，但找不到太多有用的东西。我究竟做错了什么？

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