【发布时间】：2014-01-15 14:24:37
【问题描述】：
我正在尝试升级到需要 SASS 3.3.0.rc.2 的最新 susy grid gem。我使用 Compass，这意味着我还需要将 Compass 升级到最新的 alpha (1.0.0.alpha.17)
当我尝试加载 Rails 应用程序时，我得到了这个堆栈跟踪：
rake aborted!
ERROR: Rails.root is nil!
/Users/chrisgriffin/.rvm/gems/ruby-2.0.0-p353@creator/gems/sass-3.3.0.rc.2/lib/sass/util.rb:450:in `rails_root'
/Users/chrisgriffin/.rvm/gems/ruby-2.0.0-p353@creator/gems/sass-3.3.0.rc.2/lib/sass/plugin/rails.rb:11:in `default_options'
/Users/chrisgriffin/.rvm/gems/ruby-2.0.0-p353@creator/gems/sass-3.3.0.rc.2/lib/sass/plugin/configuration.rb:33:in `options'
/Users/chrisgriffin/.rvm/gems/ruby-2.0.0-p353@creator/gems/sass-3.3.0.rc.2/lib/sass/plugin/compiler.rb:38:in `initialize'
/Users/chrisgriffin/.rvm/gems/ruby-2.0.0-p353@creator/gems/sass-3.3.0.rc.2/lib/sass/plugin.rb:63:in `new'
/Users/chrisgriffin/.rvm/gems/ruby-2.0.0-p353@creator/gems/sass-3.3.0.rc.2/lib/sass/plugin.rb:63:in `compiler'
/Users/chrisgriffin/.rvm/gems/ruby-2.0.0-p353@creator/gems/sass-3.3.0.rc.2/lib/sass/plugin.rb:121:in `options'
/Users/chrisgriffin/.rvm/gems/ruby-2.0.0-p353@creator/gems/sass-3.3.0.rc.2/lib/sass/plugin/rails.rb:24:in `<top (required)>'
/Users/chrisgriffin/.rvm/gems/ruby-2.0.0-p353@creator/gems/activesupport-4.0.0/lib/active_support/dependencies.rb:228:in `require'
/Users/chrisgriffin/.rvm/gems/ruby-2.0.0-p353@creator/gems/activesupport-4.0.0/lib/active_support/dependencies.rb:228:in `block in require'
/Users/chrisgriffin/.rvm/gems/ruby-2.0.0-p353@creator/gems/activesupport-4.0.0/lib/active_support/dependencies.rb:213:in `load_dependency'
/Users/chrisgriffin/.rvm/gems/ruby-2.0.0-p353@creator/gems/activesupport-4.0.0/lib/active_support/dependencies.rb:228:in `require'
/Users/chrisgriffin/.rvm/gems/ruby-2.0.0-p353@creator/gems/sass-3.3.0.rc.2/lib/sass/plugin.rb:128:in `<top (required)>'
/Users/chrisgriffin/.rvm/gems/ruby-2.0.0-p353@creator/gems/activesupport-4.0.0/lib/active_support/dependencies.rb:228:in `require'
/Users/chrisgriffin/.rvm/gems/ruby-2.0.0-p353@creator/gems/activesupport-4.0.0/lib/active_support/dependencies.rb:228:in `block in require'
/Users/chrisgriffin/.rvm/gems/ruby-2.0.0-p353@creator/gems/activesupport-4.0.0/lib/active_support/dependencies.rb:213:in `load_dependency'
/Users/chrisgriffin/.rvm/gems/ruby-2.0.0-p353@creator/gems/activesupport-4.0.0/lib/active_support/dependencies.rb:228:in `require'
/Users/chrisgriffin/.rvm/gems/ruby-2.0.0-p353@creator/gems/compass-core-1.0.0.alpha.16/lib/compass/core.rb:51:in `<top (required)>'
/Users/chrisgriffin/.rvm/gems/ruby-2.0.0-p353@creator/gems/activesupport-4.0.0/lib/active_support/dependencies.rb:228:in `require'
/Users/chrisgriffin/.rvm/gems/ruby-2.0.0-p353@creator/gems/activesupport-4.0.0/lib/active_support/dependencies.rb:228:in `block in require'
/Users/chrisgriffin/.rvm/gems/ruby-2.0.0-p353@creator/gems/activesupport-4.0.0/lib/active_support/dependencies.rb:213:in `load_dependency'
/Users/chrisgriffin/.rvm/gems/ruby-2.0.0-p353@creator/gems/activesupport-4.0.0/lib/active_support/dependencies.rb:228:in `require'
/Users/chrisgriffin/.rvm/gems/ruby-2.0.0-p353@creator/gems/compass-1.0.0.alpha.17/lib/compass.rb:15:in `block in <top (required)>'
/Users/chrisgriffin/.rvm/gems/ruby-2.0.0-p353@creator/gems/compass-1.0.0.alpha.17/lib/compass.rb:14:in `each'
/Users/chrisgriffin/.rvm/gems/ruby-2.0.0-p353@creator/gems/compass-1.0.0.alpha.17/lib/compass.rb:14:in `<top (required)>'
/Users/chrisgriffin/.rvm/gems/ruby-2.0.0-p353@global/gems/bundler-1.5.0/lib/bundler/runtime.rb:76:in `require'
/Users/chrisgriffin/.rvm/gems/ruby-2.0.0-p353@global/gems/bundler-1.5.0/lib/bundler/runtime.rb:76:in `block (2 levels) in require'
/Users/chrisgriffin/.rvm/gems/ruby-2.0.0-p353@global/gems/bundler-1.5.0/lib/bundler/runtime.rb:72:in `each'
/Users/chrisgriffin/.rvm/gems/ruby-2.0.0-p353@global/gems/bundler-1.5.0/lib/bundler/runtime.rb:72:in `block in require'
/Users/chrisgriffin/.rvm/gems/ruby-2.0.0-p353@global/gems/bundler-1.5.0/lib/bundler/runtime.rb:61:in `each'
/Users/chrisgriffin/.rvm/gems/ruby-2.0.0-p353@global/gems/bundler-1.5.0/lib/bundler/runtime.rb:61:in `require'
/Users/chrisgriffin/.rvm/gems/ruby-2.0.0-p353@global/gems/bundler-1.5.0/lib/bundler.rb:131:in `require'
/Users/chrisgriffin/code/apps/fullscreen/creator/config/application.rb:7:in `<top (required)>'
/Users/chrisgriffin/code/apps/fullscreen/creator/Rakefile:4:in `require'
/Users/chrisgriffin/code/apps/fullscreen/creator/Rakefile:4:in `<top (required)>'
/Users/chrisgriffin/.rvm/gems/ruby-2.0.0-p353@global/bin/ruby_executable_hooks:15:in `eval'
/Users/chrisgriffin/.rvm/gems/ruby-2.0.0-p353@global/bin/ruby_executable_hooks:15:in `<main>'
(See full trace by running task with --trace)
谷歌搜索将我带到这个问题：https://github.com/nex3/sass/issues/1033，它给出了解释并在 SASS 中修复了它，尽管尚未发布新的 RC。在新的 RC 出现之前，是否有解决方法？有什么我能做的吗？
【问题讨论】：
标签： ruby-on-rails-4 sass compass-sass susy-compass