compas pre5 bug

TypeError: can't convert nil into String

Backtrace:
/vendor/bundler_gems/ruby/1.8/gems/haml-2.2.17/lib/sass/files.rb:94:in `join'
/vendor/bundler_gems/ruby/1.8/gems/haml-2.2.17/lib/sass/files.rb:94:in `sassc_filename'
/vendor/bundler_gems/ruby/1.8/gems/haml-2.2.17/lib/sass/files.rb:23:in `tree_for'
/vendor/bundler_gems/ruby/1.8/gems/haml-2.2.17/lib/sass/plugin.rb:96:in `update_stylesheet'
/vendor/bundler_gems/ruby/1.8/gems/haml-2.2.17/lib/sass/plugin.rb:82:in `update_stylesheets'
/vendor/bundler_gems/ruby/1.8/gems/haml-2.2.17/lib/sass/plugin.rb:77:in `each'
/vendor/bundler_gems/ruby/1.8/gems/haml-2.2.17/lib/sass/plugin.rb:77:in `update_stylesheets'
/vendor/bundler_gems/ruby/1.8/gems/haml-2.2.17/lib/sass/plugin.rb:75:in `each'
/vendor/bundler_gems/ruby/1.8/gems/haml-2.2.17/lib/sass/plugin.rb:75:in `update_stylesheets'
/vendor/bundler_gems/ruby/1.8/gems/haml-2.2.17/lib/sass/plugin.rb:62:in `check_for_updates'
/vendor/bundler_gems/ruby/1.8/gems/haml-2.2.17/lib/sass/plugin/rails.rb:18:in `process_without_compass'
/vendor/bundler_gems/ruby/1.8/gems/compass-0.10.0.pre5/lib/compass/app_integration/rails/action_controller.rb:7:in `process'
/vendor/bundler_gems/ruby/1.8/gems/actionpack-2.3.5/lib/action_controller/base.rb:391:in `process'
/vendor/bundler_gems/ruby/1.8/gems/actionpack-2.3.5/lib/action_controller/base.rb:386:in `call'
/vendor/bundler_gems/ruby/1.8/gems/actionpack-2.3.5/lib/action_controller/routing/route_set.rb:437:in `call'
/vendor/bundler_gems/ruby/1.8/gems/actionpack-2.3.5/lib/action_controller/dispatcher.rb:87:in `dispatch'
/vendor/bundler_gems/ruby/1.8/gems/actionpack-2.3.5/lib/action_controller/dispatcher.rb:121:in `_call'
/vendor/bundler_gems/ruby/1.8/gems/actionpack-2.3.5/lib/action_controller/dispatcher.rb:130:in `build_middleware_stack'
/vendor/bundler_gems/ruby/1.8/gems/activerecord-2.3.5/lib/active_record/query_cache.rb:29:in `call'
/vendor/bundler_gems/ruby/1.8/gems/activerecord-2.3.5/lib/active_record/query_cache.rb:29:in `call'
/vendor/bundler_gems/ruby/1.8/gems/activerecord-2.3.5/lib/active_record/connection_adapters/abstract/query_cache.rb:34:in `cache'
/vendor/bundler_gems/ruby/1.8/gems/activerecord-2.3.5/lib/active_record/query_cache.rb:9:in `cache'
/vendor/bundler_gems/ruby/1.8/gems/activerecord-2.3.5/lib/active_record/query_cache.rb:28:in `call'
/vendor/bundler_gems/ruby/1.8/gems/activerecord-2.3.5/lib/active_record/connection_adapters/abstract/connection_pool.rb:361:in `call'
/vendor/bundler_gems/ruby/1.8/gems/actionpack-2.3.5/lib/action_controller/string_coercion.rb:25:in `call'
/vendor/bundler_gems/ruby/1.8/gems/rack-1.0.1/lib/rack/head.rb:9:in `call'
/vendor/bundler_gems/ruby/1.8/gems/rack-1.0.1/lib/rack/methodoverride.rb:24:in `call'
/vendor/bundler_gems/ruby/1.8/gems/actionpack-2.3.5/lib/action_controller/params_parser.rb:15:in `call'
/vendor/bundler_gems/ruby/1.8/gems/actionpack-2.3.5/lib/action_controller/session/cookie_store.rb:93:in `call'
/vendor/bundler_gems/ruby/1.8/gems/actionpack-2.3.5/lib/action_controller/failsafe.rb:26:in `call'
/vendor/bundler_gems/ruby/1.8/gems/rack-1.0.1/lib/rack/lock.rb:11:in `call'
/vendor/bundler_gems/ruby/1.8/gems/rack-1.0.1/lib/rack/lock.rb:11:in `synchronize'
/vendor/bundler_gems/ruby/1.8/gems/rack-1.0.1/lib/rack/lock.rb:11:in `call'
/vendor/bundler_gems/ruby/1.8/gems/actionpack-2.3.5/lib/action_controller/dispatcher.rb:114:in `call'
/vendor/bundler_gems/ruby/1.8/gems/actionpack-2.3.5/lib/action_controller/reloader.rb:34:in `run'
/vendor/bundler_gems/ruby/1.8/gems/actionpack-2.3.5/lib/action_controller/dispatcher.rb:108:in `call'
/vendor/bundler_gems/ruby/1.8/gems/rails-2.3.5/lib/rails/rack/static.rb:31:in `call'
/vendor/bundler_gems/ruby/1.8/gems/rack-1.0.1/lib/rack/urlmap.rb:46:in `call'
/vendor/bundler_gems/ruby/1.8/gems/rack-1.0.1/lib/rack/urlmap.rb:40:in `each'
/vendor/bundler_gems/ruby/1.8/gems/rack-1.0.1/lib/rack/urlmap.rb:40:in `call'
/vendor/bundler_gems/ruby/1.8/gems/rails-2.3.5/lib/rails/rack/log_tailer.rb:17:in `call'
/vendor/bundler_gems/ruby/1.8/gems/rack-1.0.1/lib/rack/content_length.rb:13:in `call'
/vendor/bundler_gems/ruby/1.8/gems/rack-1.0.1/lib/rack/chunked.rb:15:in `call'
/vendor/bundler_gems/ruby/1.8/gems/rack-1.0.1/lib/rack/handler/mongrel.rb:64:in `process'
/vendor/bundler_gems/ruby/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:159:in `process_client'
/vendor/bundler_gems/ruby/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:158:in `each'
/vendor/bundler_gems/ruby/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:158:in `process_client'
/vendor/bundler_gems/ruby/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:285:in `run'
/vendor/bundler_gems/ruby/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:285:in `initialize'
/vendor/bundler_gems/ruby/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:285:in `new'
/vendor/bundler_gems/ruby/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:285:in `run'
/vendor/bundler_gems/ruby/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:268:in `initialize'
/vendor/bundler_gems/ruby/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:268:in `new'
/vendor/bundler_gems/ruby/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:268:in `run'
/vendor/bundler_gems/ruby/1.8/gems/rack-1.0.1/lib/rack/handler/mongrel.rb:34:in `run'
/vendor/bundler_gems/ruby/1.8/gems/rails-2.3.5/lib/commands/server.rb:111
/Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
/Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:in `require'
script/server:3