アセットのプリコンパイルでエラーが出る

###前提・実現したいこと
アセットのプリコンパイルでエラーが出る

###発生している問題・エラーメッセージ

bundle exec rake assets:precompile --trace RAILS_ENV=production
** Invoke assets:precompile (first_time)
** Invoke assets:environment (first_time)
** Execute assets:environment
** Invoke environment (first_time)
** Execute environment
** Execute assets:precompile
rake aborted!
Sass::SyntaxError: Invalid CSS after "*/": expected selector or at-rule, was "{"
(sass):3
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/sass-3.4.22/lib/sass/scss/parser.rb:1189:in `expected'
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/sass-3.4.22/lib/sass/scss/parser.rb:1125:in `expected'
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/sass-3.4.22/lib/sass/scss/parser.rb:42:in `parse'
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/sass-3.4.22/lib/sass/engine.rb:406:in `_to_tree'
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/sass-3.4.22/lib/sass/engine.rb:281:in `render'
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/sprockets-3.6.0/lib/sprockets/sass_compressor.rb:48:in `call'
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/sprockets-3.6.0/lib/sprockets/sass_compressor.rb:28:in `call'
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/sprockets-3.6.0/lib/sprockets/processor_utils.rb:75:in `call_processor'
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/sprockets-3.6.0/lib/sprockets/processor_utils.rb:57:in `block in call_processors'
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/sprockets-3.6.0/lib/sprockets/processor_utils.rb:56:in `reverse_each'
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/sprockets-3.6.0/lib/sprockets/processor_utils.rb:56:in `call_processors'
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/sprockets-3.6.0/lib/sprockets/loader.rb:134:in `load_from_unloaded'
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/sprockets-3.6.0/lib/sprockets/loader.rb:60:in `block in load'
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/sprockets-3.6.0/lib/sprockets/loader.rb:317:in `fetch_asset_from_dependency_cache'
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/sprockets-3.6.0/lib/sprockets/loader.rb:44:in `load'
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/sprockets-3.6.0/lib/sprockets/cached_environment.rb:20:in `block in initialize'
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/sprockets-3.6.0/lib/sprockets/cached_environment.rb:47:in `yield'
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/sprockets-3.6.0/lib/sprockets/cached_environment.rb:47:in `load'
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/sprockets-3.6.0/lib/sprockets/base.rb:66:in `find_asset'
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/sprockets-3.6.0/lib/sprockets/base.rb:73:in `find_all_linked_assets'
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/sprockets-3.6.0/lib/sprockets/manifest.rb:142:in `block in find'
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/sprockets-3.6.0/lib/sprockets/legacy.rb:114:in `block (2 levels) in logical_paths'
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/sprockets-3.6.0/lib/sprockets/path_utils.rb:223:in `block in stat_tree'
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/sprockets-3.6.0/lib/sprockets/path_utils.rb:207:in `block in stat_directory'
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/sprockets-3.6.0/lib/sprockets/path_utils.rb:204:in `each'
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/sprockets-3.6.0/lib/sprockets/path_utils.rb:204:in `stat_directory'
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/sprockets-3.6.0/lib/sprockets/path_utils.rb:222:in `stat_tree'
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/sprockets-3.6.0/lib/sprockets/legacy.rb:105:in `each'
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/sprockets-3.6.0/lib/sprockets/legacy.rb:105:in `block in logical_paths'
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/sprockets-3.6.0/lib/sprockets/legacy.rb:104:in `each'
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/sprockets-3.6.0/lib/sprockets/legacy.rb:104:in `logical_paths'
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/sprockets-3.6.0/lib/sprockets/manifest.rb:140:in `find'
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/sprockets-3.6.0/lib/sprockets/manifest.rb:185:in `compile'
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/sprockets-rails-3.0.4/lib/sprockets/rails/task.rb:68:in `block (3 levels) in define'
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/sprockets-3.6.0/lib/rake/sprocketstask.rb:147:in `with_logger'
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/sprockets-rails-3.0.4/lib/sprockets/rails/task.rb:67:in `block (2 levels) in define'
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/rake-11.1.2/lib/rake/task.rb:248:in `call'
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/rake-11.1.2/lib/rake/task.rb:248:in `block in execute'
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/rake-11.1.2/lib/rake/task.rb:243:in `each'
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/rake-11.1.2/lib/rake/task.rb:243:in `execute'
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/rake-11.1.2/lib/rake/task.rb:187:in `block in invoke_with_call_chain'
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/2.2.0/monitor.rb:211:in `mon_synchronize'
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/rake-11.1.2/lib/rake/task.rb:180:in `invoke_with_call_chain'
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/rake-11.1.2/lib/rake/task.rb:173:in `invoke'
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/rake-11.1.2/lib/rake/application.rb:150:in `invoke_task'
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/rake-11.1.2/lib/rake/application.rb:106:in `block (2 levels) in top_level'
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/rake-11.1.2/lib/rake/application.rb:106:in `each'
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/rake-11.1.2/lib/rake/application.rb:106:in `block in top_level'
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/rake-11.1.2/lib/rake/application.rb:115:in `run_with_threads'
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/rake-11.1.2/lib/rake/application.rb:100:in `top_level'
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/rake-11.1.2/lib/rake/application.rb:78:in `block in run'
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/rake-11.1.2/lib/rake/application.rb:176:in `standard_exception_handling'
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/rake-11.1.2/lib/rake/application.rb:75:in `run'
/home/vagrant/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/rake-11.1.2/bin/rake:33:in `<top (required)>'
/home/vagrant/.rbenv/versions/2.2.2/bin/rake:23:in `load'
/home/vagrant/.rbenv/versions/2.2.2/bin/rake:23:in `<main>'
Tasks: TOP => assets:precompile

###試したこと
config/environments/production.rbのconfig.assets.compileとconfig.serve_static_files をtrueにしたのですが、改善されませんでした
###補足情報(言語/FW/ツール等のバージョンなど)
rails 4.2.6 、sass 3.4.22、sass-rails 5.0.5

http://qiita.com/naoki_mochizuki/items/f795fe3e661a3349a7ce
上のサイトの1から4でAWSを構築しました

https://github.com/kmasahiko06