octopress中rake generate各种出错

在windows的Railsinstaller环境下用octopress搭建了博客却一直发布不了文章，rake generate时候各种出错...请问这是什么回事？
感觉ruby-taiwan这边更多的讨论octopress所以就在这发帖了。不善用繁体字，见谅...

E:\RailsInstaller\rapp\MyOcto>bundle exec rake generate
## Generating Site with Jekyll
unchanged sass/screen.scss
Configuration from E:/RailsInstaller/rapp/MyOcto/_config.yml
Building site: source -> public
E:/RailsInstaller/Ruby1.9.2/lib/ruby/gems/1.9.1/gems/jekyll-0.11.0/lib/jekyll/co
nvertible.rb:30:in `read_yaml': invalid byte sequence in GBK (ArgumentError)
from E:/RailsInstaller/Ruby1.9.2/lib/ruby/gems/1.9.1/gems/jekyll-0.11.0/
lib/jekyll/post.rb:39:in `initialize'
from E:/RailsInstaller/rapp/MyOcto/plugins/preview_unpublished.rb:23:in
`new'
from E:/RailsInstaller/rapp/MyOcto/plugins/preview_unpublished.rb:23:in
`block in read_posts'
from E:/RailsInstaller/rapp/MyOcto/plugins/preview_unpublished.rb:21:in
`each'
from E:/RailsInstaller/rapp/MyOcto/plugins/preview_unpublished.rb:21:in
`read_posts'
from E:/RailsInstaller/Ruby1.9.2/lib/ruby/gems/1.9.1/gems/jekyll-0.11.0/
lib/jekyll/site.rb:128:in `read_directories'
from E:/RailsInstaller/Ruby1.9.2/lib/ruby/gems/1.9.1/gems/jekyll-0.11.0/
lib/jekyll/site.rb:98:in `read'
from E:/RailsInstaller/Ruby1.9.2/lib/ruby/gems/1.9.1/gems/jekyll-0.11.0/
lib/jekyll/site.rb:38:in `process'
from E:/RailsInstaller/Ruby1.9.2/lib/ruby/gems/1.9.1/gems/jekyll-0.11.0/
bin/jekyll:250:in `<top (required)>'
from E:/RailsInstaller/Ruby1.9.2/lib/ruby/gems/1.9.1/bin/jekyll:19:in `l
oad'
from E:/RailsInstaller/Ruby1.9.2/lib/ruby/gems/1.9.1/bin/jekyll:19:in `<
main>'