slidedown error

gistfile1.txt

/home/lizhenbo/.rvm/gems/ruby-2.0.0-p353/gems/open4-1.3.4/lib/open4.rb:37:in `exec': No such file or directory - /usr/local/bin/pygmentize (Errno::ENOENT)
	from /home/lizhenbo/.rvm/gems/ruby-2.0.0-p353/gems/open4-1.3.4/lib/open4.rb:37:in `block in popen4'
	from /home/lizhenbo/.rvm/gems/ruby-2.0.0-p353/gems/open4-1.3.4/lib/open4.rb:85:in `call'
	from /home/lizhenbo/.rvm/gems/ruby-2.0.0-p353/gems/open4-1.3.4/lib/open4.rb:85:in `block in do_popen'
	from /home/lizhenbo/.rvm/gems/ruby-2.0.0-p353/gems/open4-1.3.4/lib/open4.rb:62:in `fork'
	from /home/lizhenbo/.rvm/gems/ruby-2.0.0-p353/gems/open4-1.3.4/lib/open4.rb:62:in `do_popen'
	from /home/lizhenbo/.rvm/gems/ruby-2.0.0-p353/gems/open4-1.3.4/lib/open4.rb:34:in `popen4'
	from /home/lizhenbo/.rvm/gems/ruby-2.0.0-p353/gems/makers-mark-0.1.1/vendor/albino.rb:63:in `execute'
	from /home/lizhenbo/.rvm/gems/ruby-2.0.0-p353/gems/makers-mark-0.1.1/vendor/albino.rb:70:in `colorize'
	from /home/lizhenbo/.rvm/gems/ruby-2.0.0-p353/gems/makers-mark-0.1.1/lib/makers-mark/generator.rb:22:in `block in highlight!'
	from /home/lizhenbo/.rvm/gems/ruby-2.0.0-p353/gems/nokogiri-1.6.3.1/lib/nokogiri/xml/node_set.rb:237:in `block in each'
	from /home/lizhenbo/.rvm/gems/ruby-2.0.0-p353/gems/nokogiri-1.6.3.1/lib/nokogiri/xml/node_set.rb:236:in `upto'
	from /home/lizhenbo/.rvm/gems/ruby-2.0.0-p353/gems/nokogiri-1.6.3.1/lib/nokogiri/xml/node_set.rb:236:in `each'
	from /home/lizhenbo/.rvm/gems/ruby-2.0.0-p353/gems/makers-mark-0.1.1/lib/makers-mark/generator.rb:19:in `highlight!'
	from /home/lizhenbo/.rvm/gems/ruby-2.0.0-p353/gems/makers-mark-0.1.1/lib/makers-mark/generator.rb:8:in `to_html'
	from /home/lizhenbo/.rvm/gems/ruby-2.0.0-p353/gems/slidedown-0.2.0/lib/slide.rb:13:in `html'
	from (erb):37:in `block in render'
	from (erb):34:in `each'
	from (erb):34:in `each_with_index'
	from (erb):34:in `render'
	from /home/lizhenbo/.rvm/rubies/ruby-2.0.0-p353/lib/ruby/2.0.0/erb.rb:849:in `eval'
	from /home/lizhenbo/.rvm/rubies/ruby-2.0.0-p353/lib/ruby/2.0.0/erb.rb:849:in `result'
	from /home/lizhenbo/.rvm/gems/ruby-2.0.0-p353/gems/slidedown-0.2.0/lib/slidedown.rb:73:in `render'
	from /home/lizhenbo/.rvm/gems/ruby-2.0.0-p353/gems/slidedown-0.2.0/lib/slidedown.rb:44:in `render'
	from /home/lizhenbo/.rvm/gems/ruby-2.0.0-p353/gems/slidedown-0.2.0/lib/slidedown.rb:25:in `run!'
	from /home/lizhenbo/.rvm/gems/ruby-2.0.0-p353/gems/slidedown-0.2.0/bin/slidedown:5:in `<top (required)>'
	from /home/lizhenbo/.rvm/gems/ruby-2.0.0-p353/bin/slidedown:23:in `load'
	from /home/lizhenbo/.rvm/gems/ruby-2.0.0-p353/bin/slidedown:23:in `<main>'
	from /home/lizhenbo/.rvm/gems/ruby-2.0.0-p353/bin/ruby_executable_hooks:15:in `eval'
	from /home/lizhenbo/.rvm/gems/ruby-2.0.0-p353/bin/ruby_executable_hooks:15:in `<main>'