似乎已经更新了一些破坏 compass 或口香糖的东西。直到几天前，直到我更新了我的gem和gemfile为止，它一直运行良好。现在，即使回到较早的gemfile，它仍然会给我错误。
我在关于如何重新创建它的注释中打开了一个详细的问题，并附带了详细信息here
有谁知道我可以解决此问题的更好方法吗？我真的无法超越它或做任何事情。
疑似代码行
从完整的堆栈跟踪中，我可以看到错误来自this line in compass，它似乎得到了其变量from this line in Gumby
最小代码量
产生该错误所需的最少代码量是安装Gumby，该产品已经安装在项目here和我的gemfile中，其中包括rails 4.0。
gem 文件:
source 'https://rubygems.org'
gem 'rails', '4.0.2'
gem 'jquery-rails'
gem 'jquery-ui-rails'
gem 'turbolinks'
gem 'sass-rails'
gem 'coffee-rails', '~> 4.0.0'
gem 'uglifier', '>= 1.3.0'
gem 'compass-rails'
gem 'modular-scale'
gem "slim-rails"
gem 'sqlite3'
gem "mini_magick"
gem 'carrierwave'
gem "fog", "~> 1.3.1"
gem "pg"
gem 'will_paginate', '~> 3.0.0'
gem 'resque', "~> 1.22.0", :require => "resque/server"
gem 'exception_notification'
gem 'httparty'
gem 'devise'
gem "active_model_serializers"
gem "rails_best_practices"
group :doc do
gem 'sdoc', require: false
end
gem 'bullet'
gem 'rails_12factor', group: :production
全栈跟踪:
compass (0.12.2) frameworks/compass/stylesheets/compass/typography/_vertical_rhythm.scss:36
compass (0.12.2) frameworks/compass/stylesheets/compass/_typography.scss:4
compass (0.12.2) frameworks/compass/stylesheets/_compass.scss:2
app/assets/stylesheets/gumby/gumby.scss:28
app/assets/stylesheets/application.scss:1
sass (3.2.14) lib/sass/script/number.rb:394:in `coercion_factor'
sass (3.2.14) lib/sass/script/number.rb:325:in `coerce'
sass (3.2.14) lib/sass/script/number.rb:375:in `operate'
sass (3.2.14) lib/sass/script/number.rb:119:in `minus'
sass (3.2.14) lib/sass/script/operation.rb:89:in `_perform'
sass (3.2.14) lib/sass/script/node.rb:40:in `perform'
sass (3.2.14) lib/sass/script/operation.rb:73:in `_perform'
sass (3.2.14) lib/sass/script/node.rb:40:in `perform'
sass (3.2.14) lib/sass/script/operation.rb:73:in `_perform'
sass (3.2.14) lib/sass/script/node.rb:40:in `perform'
sass (3.2.14) lib/sass/tree/visitors/perform.rb:327:in `visit_variable'
sass (3.2.14) lib/sass/tree/visitors/base.rb:37:in `visit'
sass (3.2.14) lib/sass/tree/visitors/perform.rb:100:in `visit'
sass (3.2.14) lib/sass/tree/visitors/perform.rb:227:in `block in visit_import'
sass (3.2.14) lib/sass/tree/visitors/perform.rb:227:in `map'
sass (3.2.14) lib/sass/tree/visitors/perform.rb:227:in `visit_import'
sass (3.2.14) lib/sass/tree/visitors/base.rb:37:in `visit'
sass (3.2.14) lib/sass/tree/visitors/perform.rb:100:in `visit'
sass (3.2.14) lib/sass/tree/visitors/perform.rb:227:in `block in visit_import'
sass (3.2.14) lib/sass/tree/visitors/perform.rb:227:in `map'
sass (3.2.14) lib/sass/tree/visitors/perform.rb:227:in `visit_import'
sass (3.2.14) lib/sass/tree/visitors/base.rb:37:in `visit'
sass (3.2.14) lib/sass/tree/visitors/perform.rb:100:in `visit'
sass (3.2.14) lib/sass/tree/visitors/perform.rb:227:in `block in visit_import'
sass (3.2.14) lib/sass/tree/visitors/perform.rb:227:in `map'
sass (3.2.14) lib/sass/tree/visitors/perform.rb:227:in `visit_import'
sass (3.2.14) lib/sass/tree/visitors/base.rb:37:in `visit'
sass (3.2.14) lib/sass/tree/visitors/perform.rb:100:in `visit'
sass (3.2.14) lib/sass/tree/visitors/perform.rb:227:in `block in visit_import'
sass (3.2.14) lib/sass/tree/visitors/perform.rb:227:in `map'
sass (3.2.14) lib/sass/tree/visitors/perform.rb:227:in `visit_import'
sass (3.2.14) lib/sass/tree/visitors/base.rb:37:in `visit'
sass (3.2.14) lib/sass/tree/visitors/perform.rb:100:in `visit'
sass (3.2.14) lib/sass/tree/visitors/base.rb:53:in `block in visit_children'
sass (3.2.14) lib/sass/tree/visitors/base.rb:53:in `map'
sass (3.2.14) lib/sass/tree/visitors/base.rb:53:in `visit_children'
sass (3.2.14) lib/sass/tree/visitors/perform.rb:109:in `block in visit_children'
sass (3.2.14) lib/sass/tree/visitors/perform.rb:121:in `with_environment'
sass (3.2.14) lib/sass/tree/visitors/perform.rb:108:in `visit_children'
sass (3.2.14) lib/sass/tree/visitors/base.rb:37:in `block in visit'
sass (3.2.14) lib/sass/tree/visitors/perform.rb:128:in `visit_root'
sass (3.2.14) lib/sass/tree/visitors/base.rb:37:in `visit'
sass (3.2.14) lib/sass/tree/visitors/perform.rb:100:in `visit'
sass (3.2.14) lib/sass/tree/visitors/perform.rb:7:in `visit'
sass (3.2.14) lib/sass/tree/root_node.rb:20:in `render'
sass (3.2.14) lib/sass/engine.rb:315:in `_render'
sass (3.2.14) lib/sass/engine.rb:262:in `render'
compass-rails (1.1.3) lib/compass-rails/patches/sass_importer.rb:24:in `evaluate'
tilt (1.4.1) lib/tilt/template.rb:103:in `render'
sprockets (2.10.1) lib/sprockets/context.rb:197:in `block in evaluate'
sprockets (2.10.1) lib/sprockets/context.rb:194:in `each'
sprockets (2.10.1) lib/sprockets/context.rb:194:in `evaluate'
sprockets (2.10.1) lib/sprockets/processed_asset.rb:12:in `initialize'
sprockets (2.10.1) lib/sprockets/base.rb:374:in `new'
sprockets (2.10.1) lib/sprockets/base.rb:374:in `block in build_asset'
sprockets (2.10.1) lib/sprockets/base.rb:395:in `circular_call_protection'
sprockets (2.10.1) lib/sprockets/base.rb:373:in `build_asset'
sprockets (2.10.1) lib/sprockets/index.rb:94:in `block in build_asset'
sprockets (2.10.1) lib/sprockets/caching.rb:58:in `cache_asset'
sprockets (2.10.1) lib/sprockets/index.rb:93:in `build_asset'
sprockets (2.10.1) lib/sprockets/base.rb:287:in `find_asset'
sprockets (2.10.1) lib/sprockets/index.rb:61:in `find_asset'
sprockets (2.10.1) lib/sprockets/bundled_asset.rb:16:in `initialize'
sprockets (2.10.1) lib/sprockets/base.rb:377:in `new'
sprockets (2.10.1) lib/sprockets/base.rb:377:in `build_asset'
sprockets (2.10.1) lib/sprockets/index.rb:94:in `block in build_asset'
sprockets (2.10.1) lib/sprockets/caching.rb:58:in `cache_asset'
sprockets (2.10.1) lib/sprockets/index.rb:93:in `build_asset'
sprockets (2.10.1) lib/sprockets/base.rb:287:in `find_asset'
sprockets (2.10.1) lib/sprockets/index.rb:61:in `find_asset'
sprockets (2.10.1) lib/sprockets/environment.rb:75:in `find_asset'
sprockets (2.10.1) lib/sprockets/base.rb:295:in `[]'
sprockets-rails (2.0.1) lib/sprockets/rails/helper.rb:144:in `lookup_asset_for_path'
sprockets-rails (2.0.1) lib/sprockets/rails/helper.rb:113:in `block in stylesheet_link_tag'
sprockets-rails (2.0.1) lib/sprockets/rails/helper.rb:112:in `map'
sprockets-rails (2.0.1) lib/sprockets/rails/helper.rb:112:in `stylesheet_link_tag'
app/views/shared/_head.html.erb:36:in `_app_views_shared__head_html_erb__978649939795444344_70226324018400'
actionpack (4.0.2) lib/action_view/template.rb:143:in `block in render'
activesupport (4.0.2) lib/active_support/notifications.rb:161:in `instrument'
actionpack (4.0.2) lib/action_view/template.rb:141:in `render'
actionpack (4.0.2) lib/action_view/renderer/partial_renderer.rb:306:in `render_partial'
actionpack (4.0.2) lib/action_view/renderer/partial_renderer.rb:279:in `block in render'
actionpack (4.0.2) lib/action_view/renderer/abstract_renderer.rb:38:in `block in instrument'
activesupport (4.0.2) lib/active_support/notifications.rb:159:in `block in instrument'
activesupport (4.0.2) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
activesupport (4.0.2) lib/active_support/notifications.rb:159:in `instrument'
actionpack (4.0.2) lib/action_view/renderer/abstract_renderer.rb:38:in `instrument'
actionpack (4.0.2) lib/action_view/renderer/partial_renderer.rb:278:in `render'
actionpack (4.0.2) lib/action_view/renderer/renderer.rb:47:in `render_partial'
actionpack (4.0.2) lib/action_view/renderer/renderer.rb:21:in `render'
actionpack (4.0.2) lib/action_view/helpers/rendering_helper.rb:24:in `render'
app/views/layouts/application.html.erb:1:in `_app_views_layouts_application_html_erb___3890227880739755082_70226314239480'
actionpack (4.0.2) lib/action_view/template.rb:143:in `block in render'
activesupport (4.0.2) lib/active_support/notifications.rb:161:in `instrument'
actionpack (4.0.2) lib/action_view/template.rb:141:in `render'
actionpack (4.0.2) lib/action_view/renderer/template_renderer.rb:61:in `render_with_layout'
actionpack (4.0.2) lib/action_view/renderer/template_renderer.rb:47:in `render_template'
actionpack (4.0.2) lib/action_view/renderer/template_renderer.rb:17:in `render'
actionpack (4.0.2) lib/action_view/renderer/renderer.rb:42:in `render_template'
actionpack (4.0.2) lib/action_view/renderer/renderer.rb:23:in `render'
actionpack (4.0.2) lib/abstract_controller/rendering.rb:127:in `_render_template'
actionpack (4.0.2) lib/action_controller/metal/streaming.rb:219:in `_render_template'
actionpack (4.0.2) lib/abstract_controller/rendering.rb:120:in `render_to_body'
actionpack (4.0.2) lib/action_controller/metal/rendering.rb:33:in `render_to_body'
actionpack (4.0.2) lib/action_controller/metal/renderers.rb:26:in `render_to_body'
actionpack (4.0.2) lib/abstract_controller/rendering.rb:97:in `render'
actionpack (4.0.2) lib/action_controller/metal/rendering.rb:16:in `render'
actionpack (4.0.2) lib/action_controller/metal/instrumentation.rb:41:in `block (2 levels) in render'
activesupport (4.0.2) lib/active_support/core_ext/benchmark.rb:12:in `block in ms'
/Users/alexdollery/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/benchmark.rb:296:in `realtime'
activesupport (4.0.2) lib/active_support/core_ext/benchmark.rb:12:in `ms'
actionpack (4.0.2) lib/action_controller/metal/instrumentation.rb:41:in `block in render'
actionpack (4.0.2) lib/action_controller/metal/instrumentation.rb:84:in `cleanup_view_runtime'
activerecord (4.0.2) lib/active_record/railties/controller_runtime.rb:25:in `cleanup_view_runtime'
actionpack (4.0.2) lib/action_controller/metal/instrumentation.rb:40:in `render'
actionpack (4.0.2) lib/action_controller/metal/implicit_render.rb:10:in `default_render'
actionpack (4.0.2) lib/action_controller/metal/implicit_render.rb:5:in `send_action'
actionpack (4.0.2) lib/abstract_controller/base.rb:189:in `process_action'
actionpack (4.0.2) lib/action_controller/metal/rendering.rb:10:in `process_action'
actionpack (4.0.2) lib/abstract_controller/callbacks.rb:18:in `block in process_action'
activesupport (4.0.2) lib/active_support/callbacks.rb:403:in `_run__4424863521699852683__process_action__callbacks'
activesupport (4.0.2) lib/active_support/callbacks.rb:80:in `run_callbacks'
actionpack (4.0.2) lib/abstract_controller/callbacks.rb:17:in `process_action'
actionpack (4.0.2) lib/action_controller/metal/rescue.rb:29:in `process_action'
actionpack (4.0.2) lib/action_controller/metal/instrumentation.rb:31:in `block in process_action'
activesupport (4.0.2) lib/active_support/notifications.rb:159:in `block in instrument'
activesupport (4.0.2) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
activesupport (4.0.2) lib/active_support/notifications.rb:159:in `instrument'
actionpack (4.0.2) lib/action_controller/metal/instrumentation.rb:30:in `process_action'
actionpack (4.0.2) lib/action_controller/metal/params_wrapper.rb:245:in `process_action'
activerecord (4.0.2) lib/active_record/railties/controller_runtime.rb:18:in `process_action'
actionpack (4.0.2) lib/abstract_controller/base.rb:136:in `process'
actionpack (4.0.2) lib/abstract_controller/rendering.rb:44:in `process'
actionpack (4.0.2) lib/action_controller/metal.rb:195:in `dispatch'
actionpack (4.0.2) lib/action_controller/metal/rack_delegation.rb:13:in `dispatch'
actionpack (4.0.2) lib/action_controller/metal.rb:231:in `block in action'
actionpack (4.0.2) lib/action_dispatch/routing/route_set.rb:80:in `call'
actionpack (4.0.2) lib/action_dispatch/routing/route_set.rb:80:in `dispatch'
actionpack (4.0.2) lib/action_dispatch/routing/route_set.rb:48:in `call'
actionpack (4.0.2) lib/action_dispatch/journey/router.rb:71:in `block in call'
actionpack (4.0.2) lib/action_dispatch/journey/router.rb:59:in `each'
actionpack (4.0.2) lib/action_dispatch/journey/router.rb:59:in `call'
actionpack (4.0.2) lib/action_dispatch/routing/route_set.rb:680:in `call'
bullet (4.7.1) lib/bullet/rack.rb:10:in `call'
warden (1.2.3) lib/warden/manager.rb:35:in `block in call'
warden (1.2.3) lib/warden/manager.rb:34:in `catch'
warden (1.2.3) lib/warden/manager.rb:34:in `call'
rack (1.5.2) lib/rack/etag.rb:23:in `call'
rack (1.5.2) lib/rack/conditionalget.rb:25:in `call'
rack (1.5.2) lib/rack/head.rb:11:in `call'
actionpack (4.0.2) lib/action_dispatch/middleware/params_parser.rb:27:in `call'
actionpack (4.0.2) lib/action_dispatch/middleware/flash.rb:241:in `call'
rack (1.5.2) lib/rack/session/abstract/id.rb:225:in `context'
rack (1.5.2) lib/rack/session/abstract/id.rb:220:in `call'
actionpack (4.0.2) lib/action_dispatch/middleware/cookies.rb:486:in `call'
activerecord (4.0.2) lib/active_record/query_cache.rb:36:in `call'
activerecord (4.0.2) lib/active_record/connection_adapters/abstract/connection_pool.rb:626:in `call'
actionpack (4.0.2) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call'
activesupport (4.0.2) lib/active_support/callbacks.rb:373:in `_run__2447209521754706498__call__callbacks'
activesupport (4.0.2) lib/active_support/callbacks.rb:80:in `run_callbacks'
actionpack (4.0.2) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
actionpack (4.0.2) lib/action_dispatch/middleware/reloader.rb:64:in `call'
actionpack (4.0.2) lib/action_dispatch/middleware/remote_ip.rb:76:in `call'
actionpack (4.0.2) lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call'
actionpack (4.0.2) lib/action_dispatch/middleware/show_exceptions.rb:30:in `call'
railties (4.0.2) lib/rails/rack/logger.rb:38:in `call_app'
railties (4.0.2) lib/rails/rack/logger.rb:20:in `block in call'
activesupport (4.0.2) lib/active_support/tagged_logging.rb:67:in `block in tagged'
activesupport (4.0.2) lib/active_support/tagged_logging.rb:25:in `tagged'
activesupport (4.0.2) lib/active_support/tagged_logging.rb:67:in `tagged'
railties (4.0.2) lib/rails/rack/logger.rb:20:in `call'
actionpack (4.0.2) lib/action_dispatch/middleware/request_id.rb:21:in `call'
rack (1.5.2) lib/rack/methodoverride.rb:21:in `call'
rack (1.5.2) lib/rack/runtime.rb:17:in `call'
activesupport (4.0.2) lib/active_support/cache/strategy/local_cache.rb:83:in `call'
rack (1.5.2) lib/rack/lock.rb:17:in `call'
actionpack (4.0.2) lib/action_dispatch/middleware/static.rb:64:in `call'
rack (1.5.2) lib/rack/sendfile.rb:112:in `call'
railties (4.0.2) lib/rails/engine.rb:511:in `call'
railties (4.0.2) lib/rails/application.rb:97:in `call'
rack (1.5.2) lib/rack/lock.rb:17:in `call'
rack (1.5.2) lib/rack/content_length.rb:14:in `call'
rack (1.5.2) lib/rack/handler/webrick.rb:60:in `service'
/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/webrick/httpserver.rb:138:in `service'
/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/webrick/httpserver.rb:94:in `run'
/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/webrick/server.rb:295:in `block in start_thread'
最佳答案
Gumby和Foundation都依赖于模块化规模的扩展(这是ms()函数的来源)。由于这两个库都存在相同的问题，因此它们很可能取决于旧版本扩展的行为(特别是因为最近似乎发布了新版本)。
将依赖关系调整为模块化规模的较早版本应该可以解决问题，直到Gumby被修补为可与最新版本一起使用为止。
关于ruby-on-rails - 更新破坏性的Sass框架-不兼容的单元: 'px' and 'em' ，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/21739489/