127.0.0.1 - - [20/Nov/2013 22:37:50] "GET / HTTP/1.1" 200 1863 0.0020
[2013-11-20 22:37:50] ERROR ArgumentError: invalid byte sequence in US-ASCII
        C:/Software/Ruby193/lib/ruby/gems/1.9.1/gems/nanoc-3.6.5/lib/nanoc/cli/stream_cleaners/utf8.rb:11:in `gsub'
        C:/Software/Ruby193/lib/ruby/gems/1.9.1/gems/nanoc-3.6.5/lib/nanoc/cli/stream_cleaners/utf8.rb:11:in `clean'
        C:/Software/Ruby193/lib/ruby/gems/1.9.1/gems/nanoc-3.6.5/lib/nanoc/cli/cleaning_stream.rb:115:in `block in clean'
        C:/Software/Ruby193/lib/ruby/gems/1.9.1/gems/nanoc-3.6.5/lib/nanoc/cli/cleaning_stream.rb:115:in `each'
        C:/Software/Ruby193/lib/ruby/gems/1.9.1/gems/nanoc-3.6.5/lib/nanoc/cli/cleaning_stream.rb:115:in `inject'
        C:/Software/Ruby193/lib/ruby/gems/1.9.1/gems/nanoc-3.6.5/lib/nanoc/cli/cleaning_stream.rb:115:in `clean'
        C:/Software/Ruby193/lib/ruby/gems/1.9.1/gems/nanoc-3.6.5/lib/nanoc/cli/cleaning_stream.rb:49:in `<<'
        C:/Software/Ruby193/lib/ruby/1.9.1/webrick/httpserver.rb:213:in `block in access_log'
        C:/Software/Ruby193/lib/ruby/1.9.1/webrick/httpserver.rb:212:in `each'
        C:/Software/Ruby193/lib/ruby/1.9.1/webrick/httpserver.rb:212:in `access_log'
        C:/Software/Ruby193/lib/ruby/1.9.1/webrick/httpserver.rb:111:in `run'
        C:/Software/Ruby193/lib/ruby/1.9.1/webrick/server.rb:191:in `block in start_thread'