Merge to file on different drive causes error

Hi,

I've run into a small problem when merging my files into a file on a different drive. The process finishes successfully, but it throws an error at the end. I've copied the entire command that I used below:

D:\Scripts\Google-Bump>juicer merge main.js -s -f -o %appdata%\Mozilla\Firefox\Profiles\eyo2kaec.default\gm_scripts\google_bump\google_bump.user.js
C:/Ruby19/lib/ruby/gems/1.9.1/gems/juicer-1.0.3/lib/juicer.rb:61: warning: nested repeat operator + and ? was replaced with '*'
C:/Ruby19/lib/ruby/gems/1.9.1/gems/juicer-1.0.3/lib/juicer.rb:61: warning: nested repeat operator + and ? was replaced with '*'
C:/Ruby19/lib/ruby/gems/1.9.1/gems/juicer-1.0.3/lib/juicer.rb:61: warning: nested repeat operator + and ? was replaced with '*'
C:/Ruby19/lib/ruby/gems/1.9.1/gems/juicer-1.0.3/lib/juicer.rb:61: warning: nested repeat operator + and ? was replaced with '*'
Unable to access jarfile
C:/Ruby19/lib/ruby/1.9.1/pathname.rb:742:in `relative_path_from': different prefix: "C:/" and "D:/Scripts/Google-Bump" (ArgumentError)
        from C:/Ruby19/lib/ruby/gems/1.9.1/gems/juicer-1.0.3/lib/juicer/command/util.rb:24:in `block in relative'
        from C:/Ruby19/lib/ruby/gems/1.9.1/gems/juicer-1.0.3/lib/juicer/command/util.rb:21:in `collect'
        from C:/Ruby19/lib/ruby/gems/1.9.1/gems/juicer-1.0.3/lib/juicer/command/util.rb:21:in `relative'
        from C:/Ruby19/lib/ruby/gems/1.9.1/gems/juicer-1.0.3/lib/juicer/command/merge.rb:126:in `execute'
        from C:/Ruby19/lib/ruby/gems/1.9.1/gems/cmdparse-2.0.2/lib/cmdparse.rb:438:in `parse'
        from C:/Ruby19/lib/ruby/gems/1.9.1/gems/juicer-1.0.3/lib/juicer/cli.rb:27:in `parse'
        from C:/Ruby19/lib/ruby/gems/1.9.1/gems/juicer-1.0.3/lib/juicer/cli.rb:37:in `run'
        from C:/Ruby19/lib/ruby/gems/1.9.1/gems/juicer-1.0.3/bin/juicer:6:in `<top (required)>'
        from C:/Ruby19/bin/juicer:19:in `load'
        from C:/Ruby19/bin/juicer:19:in `<main>'

It also should be noted that I am not using a minifier. I'm not sure if that affects this issue, but its probably worth noting. I am running the code without YUI compressor installed because I want the code to be readable when it comes out.