Unable to run waveform in Ruby 2.1.0

[easyman]

Hi - I get the following error when trying to run waveform (essentially it looks like a ruby-audio problem). Have you any suggestions?

C:/RailsInstaller/Ruby2.1.0/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in require': cannot load such file -- rubyaudio_ext (LoadError) from C:/RailsInstaller/Ruby2.1.0/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:inrequire'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/ruby-audio-1.6.1-x86-mingw32/lib/ruby-audio.rb:6:in rescue in <top (required)>' from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/ruby-audio-1.6.1-x86-mingw32/lib/ruby-audio.rb:1:in<top (required)>'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in require' from C:/RailsInstaller/Ruby2.1.0/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:inrequire'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/waveform-0.1.2/lib/waveform.rb:3:in <top (required)>' from C:/RailsInstaller/Ruby2.1.0/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:inrequire'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in require' from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/waveform-0.1.2/bin/waveform:2:in<top (required)>'
from C:/RailsInstaller/Ruby2.1.0/bin/waveform:23:in load' from C:/RailsInstaller/Ruby2.1.0/bin/waveform:23:in

'