Error on Mac

[pathumego]

I just followed the instruction and when I try to generate the HTML it gives me this

Creating Keydown presentation from slides.md
(sass):1: File to import not found or unreadable: compass/css3. (Sass::SyntaxError)
Load path: /Library/Ruby/Gems/2.0.0/gems/compass-1.0.3/frameworks/compass/stylesheets
    from /Library/Ruby/Gems/2.0.0/gems/sass-3.4.13/lib/sass/tree/import_node.rb:66:in `rescue in import'
    from /Library/Ruby/Gems/2.0.0/gems/sass-3.4.13/lib/sass/tree/import_node.rb:45:in `import'
    from /Library/Ruby/Gems/2.0.0/gems/sass-3.4.13/lib/sass/tree/import_node.rb:28:in `imported_file'
    from /Library/Ruby/Gems/2.0.0/gems/sass-3.4.13/lib/sass/tree/import_node.rb:37:in `css_import?'
    from /Library/Ruby/Gems/2.0.0/gems/sass-3.4.13/lib/sass/tree/visitors/perform.rb:311:in `visit_import'
    from /Library/Ruby/Gems/2.0.0/gems/sass-3.4.13/lib/sass/tree/visitors/base.rb:36:in `visit'
    from /Library/Ruby/Gems/2.0.0/gems/sass-3.4.13/lib/sass/tree/visitors/perform.rb:158:in `block in visit'
    from /Library/Ruby/Gems/2.0.0/gems/sass-3.4.13/lib/sass/stack.rb:79:in `block in with_base'
    from /Library/Ruby/Gems/2.0.0/gems/sass-3.4.13/lib/sass/stack.rb:115:in `with_frame'
    from /Library/Ruby/Gems/2.0.0/gems/sass-3.4.13/lib/sass/stack.rb:79:in `with_base'
    from /Library/Ruby/Gems/2.0.0/gems/sass-3.4.13/lib/sass/tree/visitors/perform.rb:158:in `visit'
    from /Library/Ruby/Gems/2.0.0/gems/sass-3.4.13/lib/sass/tree/visitors/base.rb:52:in `block in visit_children'
    from /Library/Ruby/Gems/2.0.0/gems/sass-3.4.13/lib/sass/tree/visitors/base.rb:52:in `map'
    from /Library/Ruby/Gems/2.0.0/gems/sass-3.4.13/lib/sass/tree/visitors/base.rb:52:in `visit_children'
    from /Library/Ruby/Gems/2.0.0/gems/sass-3.4.13/lib/sass/tree/visitors/perform.rb:167:in `block in visit_children'
    from /Library/Ruby/Gems/2.0.0/gems/sass-3.4.13/lib/sass/tree/visitors/perform.rb:179:in `with_environment'
    from /Library/Ruby/Gems/2.0.0/gems/sass-3.4.13/lib/sass/tree/visitors/perform.rb:166:in `visit_children'
    from /Library/Ruby/Gems/2.0.0/gems/sass-3.4.13/lib/sass/tree/visitors/base.rb:36:in `block in visit'
    from /Library/Ruby/Gems/2.0.0/gems/sass-3.4.13/lib/sass/tree/visitors/perform.rb:186:in `visit_root'
    from /Library/Ruby/Gems/2.0.0/gems/sass-3.4.13/lib/sass/tree/visitors/base.rb:36:in `visit'
    from /Library/Ruby/Gems/2.0.0/gems/sass-3.4.13/lib/sass/tree/visitors/perform.rb:157:in `visit'
    from /Library/Ruby/Gems/2.0.0/gems/sass-3.4.13/lib/sass/tree/visitors/perform.rb:8:in `visit'
    from /Library/Ruby/Gems/2.0.0/gems/sass-3.4.13/lib/sass/tree/root_node.rb:36:in `css_tree'
    from /Library/Ruby/Gems/2.0.0/gems/sass-3.4.13/lib/sass/tree/root_node.rb:20:in `render'
    from /Library/Ruby/Gems/2.0.0/gems/sass-3.4.13/lib/sass/engine.rb:268:in `render'
    from /Library/Ruby/Gems/2.0.0/gems/keydown-0.9.2/lib/keydown/tasks/slides.rb:34:in `block in slides'
    from /Library/Ruby/Gems/2.0.0/gems/thor-0.19.1/lib/thor/actions/create_file.rb:53:in `call'
    from /Library/Ruby/Gems/2.0.0/gems/thor-0.19.1/lib/thor/actions/create_file.rb:53:in `render'
    from /Library/Ruby/Gems/2.0.0/gems/thor-0.19.1/lib/thor/actions/create_file.rb:46:in `identical?'
    from /Library/Ruby/Gems/2.0.0/gems/thor-0.19.1/lib/thor/actions/create_file.rb:72:in `on_conflict_behavior'
    from /Library/Ruby/Gems/2.0.0/gems/thor-0.19.1/lib/thor/actions/empty_directory.rb:113:in `invoke_with_conflict_check'
    from /Library/Ruby/Gems/2.0.0/gems/thor-0.19.1/lib/thor/actions/create_file.rb:60:in `invoke!'
    from /Library/Ruby/Gems/2.0.0/gems/thor-0.19.1/lib/thor/actions.rb:94:in `action'
    from /Library/Ruby/Gems/2.0.0/gems/thor-0.19.1/lib/thor/actions/create_file.rb:25:in `create_file'
    from /Library/Ruby/Gems/2.0.0/gems/keydown-0.9.2/lib/keydown/tasks/slides.rb:33:in `slides'
    from /Library/Ruby/Gems/2.0.0/gems/thor-0.19.1/lib/thor/command.rb:27:in `run'
    from /Library/Ruby/Gems/2.0.0/gems/thor-0.19.1/lib/thor/invocation.rb:126:in `invoke_command'
    from /Library/Ruby/Gems/2.0.0/gems/thor-0.19.1/lib/thor.rb:359:in `dispatch'
    from /Library/Ruby/Gems/2.0.0/gems/thor-0.19.1/lib/thor/base.rb:440:in `start'
    from /Library/Ruby/Gems/2.0.0/gems/keydown-0.9.2/bin/keydown:6:in `<top (required)>'
    from /usr/bin/keydown:23:in `load'
    from /usr/bin/keydown:23:in `<main>'

[dwetteroth]

This was mentioned in #34

The workaround for the moment is:

sudo gem uninstall compass sudo gem install compass -v 0.12.7