"rake generate" error.

gistfile1.txt

$ rake -t generate
** Invoke generate (first_time)
** Execute generate
## Generating Site with Jekyll
Configuration from /Users/pshon/Projects/crazypheel_octopress/_config.yml
/Users/pshon/Projects/crazypheel_octopress/plugins/category_generator.rb:73: warning: regexp has invalid interval
/Users/pshon/Projects/crazypheel_octopress/plugins/category_generator.rb:73: warning: regexp has `}' without escape
/Users/pshon/Projects/crazypheel_octopress/plugins/category_generator.rb:110: warning: regexp has invalid interval
/Users/pshon/Projects/crazypheel_octopress/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/pshon/Projects/crazypheel_octopress/plugins/pygments_code.rb:5: warning: already initialized constant PYGMENTS_CACHE_DIR
Building site: source -> public
./plugins/backtick_code_block.rb:13:in `render_code_block': stack level too deep (SystemStackError)
	from ./plugins/octopress_filters.rb:11:in `pre_filter'
	from ./plugins/octopress_filters.rb:26:in `pre_render'
	from /Users/pshon/Projects/crazypheel_octopress/plugins/post_filters.rb:112:in `pre_render'
	from /Users/pshon/Projects/crazypheel_octopress/plugins/post_filters.rb:111:in `each'
	from /Users/pshon/Projects/crazypheel_octopress/plugins/post_filters.rb:111:in `pre_render'
	from ./plugins/post_filters.rb:166:in `old_do_layout'
	from ./plugins/post_filters.rb:167:in `old_do_layout'
	from /Users/pshon/Projects/crazypheel_octopress/plugins/post_filters.rb:167:in `do_layout'
	from /opt/local/lib/ruby/gems/1.8/gems/jekyll-0.11.0/bin/../lib/jekyll/page.rb:100:in `render'
	from /opt/local/lib/ruby/gems/1.8/gems/jekyll-0.11.0/bin/../lib/jekyll/site.rb:197:in `render'
	from /opt/local/lib/ruby/gems/1.8/gems/jekyll-0.11.0/bin/../lib/jekyll/site.rb:196:in `each'
	from /opt/local/lib/ruby/gems/1.8/gems/jekyll-0.11.0/bin/../lib/jekyll/site.rb:196:in `render'
	from /opt/local/lib/ruby/gems/1.8/gems/jekyll-0.11.0/bin/../lib/jekyll/site.rb:40:in `process'
	from /opt/local/lib/ruby/gems/1.8/gems/jekyll-0.11.0/bin/jekyll:250
	from /opt/local/bin/jekyll:19:in `load'
	from /opt/local/bin/jekyll:19

I ran into the same problem.