Stack trace from 'rake generate'

gistfile1.txt

-> % rake generate
## Generating Site with Jekyll
Configuration from /Users/chartjes/Sites/atthekeyboard/_config.yml
/Users/chartjes/Sites/atthekeyboard/plugins/category_generator.rb:73: warning: regexp has invalid interval
/Users/chartjes/Sites/atthekeyboard/plugins/category_generator.rb:73: warning: regexp has `}' without escape
/Users/chartjes/Sites/atthekeyboard/plugins/category_generator.rb:110: warning: regexp has invalid interval
/Users/chartjes/Sites/atthekeyboard/plugins/category_generator.rb:110: warning: regexp has `}' without escape
unchanged sass/screen.scss
./plugins/backtick_code_block.rb:5: warning: already initialized constant AllOptions
./plugins/backtick_code_block.rb:6: warning: already initialized constant LangCaption
/Users/chartjes/Sites/atthekeyboard/plugins/pygments_code.rb:5: warning: already initialized constant PYGMENTS_CACHE_DIR
Building site: source -> public
/Users/chartjes/Sites/atthekeyboard/plugins/post_filters.rb:110:in `pre_render': stack level too deep (SystemStackError)
	from ./plugins/post_filters.rb:166:in `old_do_layout'
	from ./plugins/post_filters.rb:167:in `old_do_layout'
	from /Users/chartjes/Sites/atthekeyboard/plugins/post_filters.rb:167:in `do_layout'
	from /Library/Ruby/Gems/1.8/gems/jekyll-0.11.0/lib/jekyll/post.rb:189:in `render'
	from /Library/Ruby/Gems/1.8/gems/jekyll-0.11.0/lib/jekyll/site.rb:193:in `render'
	from /Library/Ruby/Gems/1.8/gems/jekyll-0.11.0/lib/jekyll/site.rb:192:in `each'
	from /Library/Ruby/Gems/1.8/gems/jekyll-0.11.0/lib/jekyll/site.rb:192:in `render'
	from /Library/Ruby/Gems/1.8/gems/jekyll-0.11.0/lib/jekyll/site.rb:40:in `process'
	from /usr/local/bin/jekyll:178