octopress error-1

***@***:~/myblog/octopress$ bundle exec rake generate
## Generating Site with Jekyll
unchanged sass/screen.scss
Configuration from /home/eka/myblog/octopress/_config.yml
Building site: source -> public
/home/eka/.rvm/rubies/ruby-1.9.2-p318/lib/ruby/1.9.1/psych.rb:148:in `parse': couldn't parse YAML at line 7 column 0 (Psych::SyntaxError)
        from /home/eka/.rvm/rubies/ruby-1.9.2-p318/lib/ruby/1.9.1/psych.rb:148:in `parse_stream'
        from /home/eka/.rvm/rubies/ruby-1.9.2-p318/lib/ruby/1.9.1/psych.rb:119:in `parse'
        from /home/eka/.rvm/rubies/ruby-1.9.2-p318/lib/ruby/1.9.1/psych.rb:106:in `load'
        from /home/eka/.rvm/gems/ruby-1.9.2-p318/gems/jekyll-0.11.0/lib/jekyll/convertible.rb:33:in `read_yaml'
        from /home/eka/.rvm/gems/ruby-1.9.2-p318/gems/jekyll-0.11.0/lib/jekyll/post.rb:39:in `initialize'
        from /home/eka/myblog/octopress/plugins/preview_unpublished.rb:23:in `new'
        from /home/eka/myblog/octopress/plugins/preview_unpublished.rb:23:in `block in read_posts'
        from /home/eka/myblog/octopress/plugins/preview_unpublished.rb:21:in `each'
        from /home/eka/myblog/octopress/plugins/preview_unpublished.rb:21:in `read_posts'
        from /home/eka/.rvm/gems/ruby-1.9.2-p318/gems/jekyll-0.11.0/lib/jekyll/site.rb:128:in `read_directories'
        from /home/eka/.rvm/gems/ruby-1.9.2-p318/gems/jekyll-0.11.0/lib/jekyll/site.rb:98:in `read'
        from /home/eka/.rvm/gems/ruby-1.9.2-p318/gems/jekyll-0.11.0/lib/jekyll/site.rb:38:in `process'
        from /home/eka/.rvm/gems/ruby-1.9.2-p318/gems/jekyll-0.11.0/bin/jekyll:250:in `<top (required)>'
        from /home/eka/.rvm/gems/ruby-1.9.2-p318/bin/jekyll:23:in `load'
        from /home/eka/.rvm/gems/ruby-1.9.2-p318/bin/jekyll:23:in `<main>'