title: How to know the error in which specific file, Sass::SyntaxError: Invalid CSS after "}": expected selector or at-rule, was "}"
body: <p>I got <code>Sass::SyntaxError: Invalid CSS after "}": expected selector or at-rule, was "}"</code></p>
  
  <pre><code>% RAILS_ENV=production rake assets:precompile                                                                                                                 (git)-[feature/prettier_form] 
  (in /Users/ll/Dropbox/Rails/dqa_dev_server)
  rake aborted!
  Sass::SyntaxError: Invalid CSS after "}": expected selector or at-rule, was "}"
    (in /Users/ll/Dropbox/Rails/dqa_dev_server/vendor/themes/lenord-single-page-theme/application.css)
  (sass):7331
  Tasks: TOP =&gt; assets:precompile
  (See full trace by running task with --trace)
  </code></pre>
  
  <h2>UPDATE</h2>
  
  <p>I don't know why it showed me that the error was at line <code>7731</code></p>
  
  <pre><code>Sass::SyntaxError: Invalid CSS after "}": expected selector or at-rule, was "}"
    (in /Users/hsu-wei-cheng/Dropbox/Rails/dqa_dev_server/vendor/themes/lenord-single-page-theme/application.css)
  (sass):7331
  </code></pre>
  
  <p>But actually the application.css only has few lines. I think the problem is in other files, but how could I know in which file, and which line ?</p>
  
  <pre><code>/*
   *= require_self
   *= require_tree .
   */
  </code></pre>