jekyll

/var/lib/gems/1.8/gems/maruku-0.6.0/lib/maruku/string_utils.rb:71:in `normalize_key_and_value': undefined method `strip' for nil:NilClass (NoMethodError)
	from /var/lib/gems/1.8/gems/maruku-0.6.0/lib/maruku/string_utils.rb:59:in `parse_email_headers'
	from /var/lib/gems/1.8/gems/maruku-0.6.0/lib/maruku/string_utils.rb:55:in `each'
	from /var/lib/gems/1.8/gems/maruku-0.6.0/lib/maruku/string_utils.rb:55:in `parse_email_headers'
	from /var/lib/gems/1.8/gems/maruku-0.6.0/lib/maruku/input/parse_doc.rb:29:in `parse_doc'
	from /var/lib/gems/1.8/gems/maruku-0.6.0/lib/maruku/maruku.rb:30:in `initialize'
	from /var/lib/gems/1.8/gems/jekyll-0.11.2/bin/../lib/jekyll/converters/markdown.rb:120:in `new'
	from /var/lib/gems/1.8/gems/jekyll-0.11.2/bin/../lib/jekyll/converters/markdown.rb:120:in `convert'
	from /var/lib/gems/1.8/gems/jekyll-0.11.2/bin/../lib/jekyll/convertible.rb:46:in `transform'
	from /var/lib/gems/1.8/gems/jekyll-0.11.2/bin/../lib/jekyll/convertible.rb:84:in `do_layout'
	from /var/lib/gems/1.8/gems/jekyll-0.11.2/bin/../lib/jekyll/post.rb:189:in `render'
	from /var/lib/gems/1.8/gems/jekyll-0.11.2/bin/../lib/jekyll/site.rb:193:in `render'
	from /var/lib/gems/1.8/gems/jekyll-0.11.2/bin/../lib/jekyll/site.rb:192:in `each'
	from /var/lib/gems/1.8/gems/jekyll-0.11.2/bin/../lib/jekyll/site.rb:192:in `render'
	from /var/lib/gems/1.8/gems/jekyll-0.11.2/bin/../lib/jekyll/site.rb:40:in `process'
	from /var/lib/gems/1.8/gems/jekyll-0.11.2/bin/jekyll:250
	from /usr/local/bin/jekyll:19:in `load'
	from /usr/local/bin/jekyll:19

in method normalize_key.. you call .strip for nil value - some variable is nil and has no strip method. easy