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我收到一个神秘的错误cap deploy

$ cap deploy
. . .
  * executing "cd -- /rails/myapp/releases/20130919002235 && RAILS_ENV=production RAILS_GROUPS=assets bundle exec rake assets:precompile"
    servers: ["persephone"]
    [persephone] executing command
. . .
 ** [out :: persephone] rake aborted!
 ** [out :: persephone] Caught Encoding::CompatibilityError at '["ok","(function() {': incompatible encoding regexp match (ASCII-8BIT regexp with UTF-8 string)
 ** [out :: persephone] (in /rails/myapp/releases/20130919002235/app/assets/javascripts/disk_files.js.coffee)
 ** [out :: persephone] /rails/myapp/shared/bundle/ruby/2.0.0/gems/json-1.8.0/lib/json/pure/parser.rb:242:in `rescue in parse_string'
 ** [out :: persephone] /rails/myapp/shared/bundle/ruby/2.0.0/gems/json-1.8.0/lib/json/pure/parser.rb:213:in `parse_string'
 ** [out :: persephone] /rails/myapp/shared/bundle/ruby/2.0.0/gems/json-1.8.0/lib/json/pure/parser.rb:257:in `parse_value'
 ** [out :: persephone] /rails/myapp/shared/bundle/ruby/2.0.0/gems/json-1.8.0/lib/json/pure/parser.rb:121:in `parse'
 ** [out :: persephone] /rails/myapp/shared/bundle/ruby/2.0.0/gems/json-1.8.0/lib/json/common.rb:155:in `parse'
. . .

在尝试调试问题时，我尝试完全删除disk_files.js.coffee，然后出现相同的错误application.js。

然后我更改了我的application.js清单，使其不需要任何东西，然后我收到类似的错误application.css

我已经注释掉了我的自定义 CSS，现在我得到了：

 ** [out :: persephone] rake aborted!
 ** [out :: persephone] undefined method `[]' for nil:NilClass
 ** [out :: persephone] (in /rails/myapp/releases/20130919200133/app/assets/stylesheets/application.css)
 ** [out :: persephone] /rails/myapp/shared/bundle/ruby/2.0.0/gems/sprockets-2.10.0/lib/sprockets/sass_functions.rb:63:in `sprockets_context'

这些步骤中的每一个都需要一个 git commit 到 origin，然后一个cap deploy.

FWIW-添加 #encoding: UTF-8 按照SO#9857443没有帮助。

有谁知道发生了什么？我该如何调试呢？

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