Generating json fails with a stacktrace.

[jtietema]

Generating my blog and thus the ghost json export fails with the following error. Do I need a specific version of Jekyll? I'm using Octopress

/plugins/jekylltoghost.rb:55:in `generate': uninitialized constant Jekyll::Converters (NameError)
        from /home/jeroen/.rvm/gems/ruby-1.9.3-p194/gems/jekyll-0.12.0/lib/jekyll/site.rb:190:in `block in generate'
        from /home/jeroen/.rvm/gems/ruby-1.9.3-p194/gems/jekyll-0.12.0/lib/jekyll/site.rb:189:in `each'
        from /home/jeroen/.rvm/gems/ruby-1.9.3-p194/gems/jekyll-0.12.0/lib/jekyll/site.rb:189:in `generate'
        from /home/jeroen/.rvm/gems/ruby-1.9.3-p194/gems/jekyll-0.12.0/lib/jekyll/site.rb:40:in `process'
        from /home/jeroen/.rvm/gems/ruby-1.9.3-p194/gems/jekyll-0.12.0/bin/jekyll:264:in `'
        from /home/jeroen/.rvm/gems/ruby-1.9.3-p194/bin/jekyll:23:in `load'
        from /home/jeroen/.rvm/gems/ruby-1.9.3-p194/bin/jekyll:23:in `'