Rick Cogley - error on rake generate in Octopress, after adding a bunch of converted posts. Liquid Exception: invalid byte sequence in UTF-8 in atom.xml

Octopress-Rake-Generate-Error-Liquid-Exception

rcogley@RickMBP ~/Repositories/octopress-all (git)-[new_layout] % rake generate
/Users/rcogley/.rvm/gems/ruby-1.9.3-p362/gems/bundler-1.2.3/lib/bundler/runtime.rb:197: warning: Insecure world writable dir /usr/local/bin in PATH, mode 040777
## Generating Site with Jekyll
/Users/rcogley/.rvm/gems/ruby-1.9.3-p362/gems/bundler-1.2.3/lib/bundler/runtime.rb:197: warning: Insecure world writable dir /usr/local/bin in PATH, mode 040777
unchanged sass/screen.scss
/Users/rcogley/.rvm/gems/ruby-1.9.3-p362/gems/bundler-1.2.3/lib/bundler/runtime.rb:197: warning: Insecure world writable dir /usr/local/bin in PATH, mode 040777
Configuration from /Users/rcogley/Repositories/octopress-all/_config.yml
Building site: source -> public
Liquid Exception: invalid byte sequence in UTF-8 in atom.xml
/Users/rcogley/Repositories/octopress-all/plugins/octopress_filters.rb:84:in `gsub'
/Users/rcogley/Repositories/octopress-all/plugins/octopress_filters.rb:84:in `cdata_escape'
/Users/rcogley/.rvm/gems/ruby-1.9.3-p362/gems/liquid-2.3.0/lib/liquid/context.rb:58:in `invoke'
/Users/rcogley/.rvm/gems/ruby-1.9.3-p362/gems/liquid-2.3.0/lib/liquid/variable.rb:43:in `block in render'
/Users/rcogley/.rvm/gems/ruby-1.9.3-p362/gems/liquid-2.3.0/lib/liquid/variable.rb:38:in `each'
/Users/rcogley/.rvm/gems/ruby-1.9.3-p362/gems/liquid-2.3.0/lib/liquid/variable.rb:38:in `inject'
/Users/rcogley/.rvm/gems/ruby-1.9.3-p362/gems/liquid-2.3.0/lib/liquid/variable.rb:38:in `render'
/Users/rcogley/.rvm/gems/ruby-1.9.3-p362/gems/liquid-2.3.0/lib/liquid/block.rb:94:in `block in render_all'
/Users/rcogley/.rvm/gems/ruby-1.9.3-p362/gems/liquid-2.3.0/lib/liquid/block.rb:92:in `collect'
/Users/rcogley/.rvm/gems/ruby-1.9.3-p362/gems/liquid-2.3.0/lib/liquid/block.rb:92:in `render_all'
/Users/rcogley/.rvm/gems/ruby-1.9.3-p362/gems/liquid-2.3.0/lib/liquid/tags/for.rb:116:in `block (2 levels) in render'
/Users/rcogley/.rvm/gems/ruby-1.9.3-p362/gems/liquid-2.3.0/lib/liquid/tags/for.rb:104:in `each'
/Users/rcogley/.rvm/gems/ruby-1.9.3-p362/gems/liquid-2.3.0/lib/liquid/tags/for.rb:104:in `each_with_index'
/Users/rcogley/.rvm/gems/ruby-1.9.3-p362/gems/liquid-2.3.0/lib/liquid/tags/for.rb:104:in `block in render'
/Users/rcogley/.rvm/gems/ruby-1.9.3-p362/gems/liquid-2.3.0/lib/liquid/context.rb:91:in `stack'
/Users/rcogley/.rvm/gems/ruby-1.9.3-p362/gems/liquid-2.3.0/lib/liquid/tags/for.rb:103:in `render'
/Users/rcogley/.rvm/gems/ruby-1.9.3-p362/gems/liquid-2.3.0/lib/liquid/block.rb:94:in `block in render_all'
/Users/rcogley/.rvm/gems/ruby-1.9.3-p362/gems/liquid-2.3.0/lib/liquid/block.rb:92:in `collect'
/Users/rcogley/.rvm/gems/ruby-1.9.3-p362/gems/liquid-2.3.0/lib/liquid/block.rb:92:in `render_all'
/Users/rcogley/.rvm/gems/ruby-1.9.3-p362/gems/liquid-2.3.0/lib/liquid/block.rb:82:in `render'
/Users/rcogley/.rvm/gems/ruby-1.9.3-p362/gems/liquid-2.3.0/lib/liquid/template.rb:124:in `render'
/Users/rcogley/.rvm/gems/ruby-1.9.3-p362/gems/liquid-2.3.0/lib/liquid/template.rb:132:in `render!'
/Users/rcogley/.rvm/gems/ruby-1.9.3-p362/gems/jekyll-0.12.0/lib/jekyll/convertible.rb:79:in `do_layout'
/Users/rcogley/Repositories/octopress-all/plugins/post_filters.rb:167:in `do_layout'
/Users/rcogley/.rvm/gems/ruby-1.9.3-p362/gems/jekyll-0.12.0/lib/jekyll/page.rb:100:in `render'
/Users/rcogley/Repositories/octopress-all/plugins/category_generator.rb:99:in `write_category_index'
/Users/rcogley/Repositories/octopress-all/plugins/category_generator.rb:119:in `block in write_category_indexes'
/Users/rcogley/Repositories/octopress-all/plugins/category_generator.rb:118:in `each'
/Users/rcogley/Repositories/octopress-all/plugins/category_generator.rb:118:in `write_category_indexes'
/Users/rcogley/Repositories/octopress-all/plugins/category_generator.rb:137:in `generate'
/Users/rcogley/.rvm/gems/ruby-1.9.3-p362/gems/jekyll-0.12.0/lib/jekyll/site.rb:190:in `block in generate'
/Users/rcogley/.rvm/gems/ruby-1.9.3-p362/gems/jekyll-0.12.0/lib/jekyll/site.rb:189:in `each'
/Users/rcogley/.rvm/gems/ruby-1.9.3-p362/gems/jekyll-0.12.0/lib/jekyll/site.rb:189:in `generate'
/Users/rcogley/.rvm/gems/ruby-1.9.3-p362/gems/jekyll-0.12.0/lib/jekyll/site.rb:40:in `process'
/Users/rcogley/.rvm/gems/ruby-1.9.3-p362/gems/jekyll-0.12.0/bin/jekyll:264:in `<top (required)>'
/Users/rcogley/.rvm/gems/ruby-1.9.3-p362/bin/jekyll:19:in `load'
/Users/rcogley/.rvm/gems/ruby-1.9.3-p362/bin/jekyll:19:in `<main>'
/Users/rcogley/.rvm/gems/ruby-1.9.3-p362/bin/ruby_noexec_wrapper:14:in `eval'
/Users/rcogley/.rvm/gems/ruby-1.9.3-p362/bin/ruby_noexec_wrapper:14:in `<main>'
Build Failed
rake generate  33.69s user 1.60s system 99% cpu 35.588 total

How did you work it out?