error.txt

PS C:\Users\jkutner\jruby\jruby-dist-9.1.2.0-bin\jruby-9.1.2.0> .\bin\jruby.exe -S gem install warbler -v 2.0.1
NameError: uninitialized constant JRuby::Windows::File::Constants::FFI
       const_missing at org/jruby/RubyModule.java:3309
  <module:Constants> at uri:classloader:/jruby/kernel/file.rb:10
       <module:File> at uri:classloader:/jruby/kernel/file.rb:8
    <module:Windows> at uri:classloader:/jruby/kernel/file.rb:7
      <module:JRuby> at uri:classloader:/jruby/kernel/file.rb:6
               <top> at uri:classloader:/jruby/kernel/file.rb:5
                load at org/jruby/RubyKernel.java:962
               <top> at file:/C:/Users/jkutner/jruby/jruby-dist-9.1.2.0-bin/jruby-9.1.2.0/lib/jruby.jar!/jruby/kernel.rb:1