一段时间以来，我一直在将capistrano 3用于我的rails应用程序。今天，它开始在资产预编译步骤中失败，并在日志中添加了以下内容，但并没有太大帮助：
我在服务器上
Caused by:
PrecompileRequired: PrecompileRequired
Caused by:
SSHKit::Command::Failed: ls exit status: 2
ls stdout: ls: cannot access '/var/www/bubblin.io/releases/20181020142819/assets_manifest_backup': No such file or directory
ls stderr: Nothing written
Tasks: TOP => deploy:assets:precompile
(See full trace by running task with --trace)
The deploy has failed with an error: Exception while executing as marvin@bubblin.io: rake exit status: 1
rake stdout: Yarn executable was not detected in the system.
Download Yarn at https://yarnpkg.com/en/docs/install
rake aborted!
Autoprefixer doesn’t support Node v5.4.1. Update it.
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/autoprefixer-rails-9.2.1/lib/autoprefixer-rails/processor.rb:163:in `runtime'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/autoprefixer-rails-9.2.1/lib/autoprefixer-rails/processor.rb:37:in `process'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/autoprefixer-rails-9.2.1/lib/autoprefixer-rails/sprockets.rb:20:in `run'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/autoprefixer-rails-9.2.1/lib/autoprefixer-rails/sprockets.rb:14:in `call'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/processor_utils.rb:75:in `call_processor'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/processor_utils.rb:57:in `block in call_processors'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/processor_utils.rb:56:in `reverse_each'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/processor_utils.rb:56:in `call_processors'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/loader.rb:134:in `load_from_unloaded'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/loader.rb:60:in `block in load'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/loader.rb:317:in `fetch_asset_from_dependency_cache'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/loader.rb:44:in `load'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/cached_environment.rb:20:in `block in initialize'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/cached_environment.rb:47:in `load'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/bundle.rb:23:in `block in call'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/utils.rb:200:in `dfs'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/bundle.rb:24:in `call'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/processor_utils.rb:75:in `call_processor'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/processor_utils.rb:57:in `block in call_processors'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/processor_utils.rb:56:in `reverse_each'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/processor_utils.rb:56:in `call_processors'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/loader.rb:134:in `load_from_unloaded'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/loader.rb:60:in `block in load'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/loader.rb:317:in `fetch_asset_from_dependency_cache'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/loader.rb:44:in `load'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/cached_environment.rb:20:in `block in initialize'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/cached_environment.rb:47:in `load'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/context.rb:99:in `load'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/context.rb:129:in `depend_on_asset'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/context.rb:160:in `link_asset'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-rails-3.2.1/lib/sprockets/rails/context.rb:27:in `compute_asset_path'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/actionview-5.1.6/lib/action_view/helpers/asset_url_helper.rb:198:in `asset_path'
/var/www/bubblin.io/releases/20181020145802/app/assets/javascripts/serviceworkers/sw.js.erb:60:in `_evaluate_template'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/erb_processor.rb:26:in `call'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/erb_processor.rb:13:in `call'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/processor_utils.rb:75:in `call_processor'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/processor_utils.rb:57:in `block in call_processors'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/processor_utils.rb:56:in `reverse_each'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/processor_utils.rb:56:in `call_processors'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/loader.rb:134:in `load_from_unloaded'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/loader.rb:60:in `block in load'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/loader.rb:317:in `fetch_asset_from_dependency_cache'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/loader.rb:44:in `load'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/cached_environment.rb:20:in `block in initialize'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/cached_environment.rb:47:in `load'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/bundle.rb:23:in `block in call'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/utils.rb:200:in `dfs'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/bundle.rb:24:in `call'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/processor_utils.rb:75:in `call_processor'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/processor_utils.rb:57:in `block in call_processors'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/processor_utils.rb:56:in `reverse_each'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/processor_utils.rb:56:in `call_processors'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/loader.rb:134:in `load_from_unloaded'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/loader.rb:60:in `block in load'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/loader.rb:317:in `fetch_asset_from_dependency_cache'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/loader.rb:44:in `load'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/cached_environment.rb:20:in `block in initialize'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/cached_environment.rb:47:in `load'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/base.rb:66:in `find_asset'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/base.rb:73:in `find_all_linked_assets'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/manifest.rb:134:in `block in find'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/manifest.rb:133:in `each'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/manifest.rb:133:in `find'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/manifest.rb:186:in `compile'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-rails-3.2.1/lib/sprockets/rails/task.rb:68:in `block (3 levels) in define'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/rake/sprocketstask.rb:147:in `with_logger'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-rails-3.2.1/lib/sprockets/rails/task.rb:67:in `block (2 levels) in define'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/rake-12.3.1/exe/rake:27:in `<top (required)>'
/home/marvin/.rbenv/versions/2.5.1/bin/bundle:23:in `load'
/home/marvin/.rbenv/versions/2.5.1/bin/bundle:23:in `<main>'
Tasks: TOP => assets:precompile
(See full trace by running task with --trace)
rake stderr: Nothing written
** DEPLOY FAILED
** Refer to log/capistrano.log for details. Here are the last 20 lines:
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/loader.rb:60:in `block in load'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/loader.rb:317:in `fetch_asset_from_dependency_cache'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/loader.rb:44:in `load'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/cached_environment.rb:20:in `block in initialize'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/cached_environment.rb:47:in `load'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/base.rb:66:in `find_asset'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/base.rb:73:in `find_all_linked_assets'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/manifest.rb:134:in `block in find'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/manifest.rb:133:in `each'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/manifest.rb:133:in `find'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/manifest.rb:186:in `compile'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-rails-3.2.1/lib/sprockets/rails/task.rb:68:in `block (3 levels) in define'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/rake/sprocketstask.rb:147:in `with_logger'
/var/www/bubblin.io/shared/bundle/ruby/2.5.0/gems/sprockets-rails-3.2.1/lib/sprockets/rails/task.rb:67:in `block (2 levels) in define'
/var/w
DEBUG [709144dc] ww/bubblin.io/shared/bundle/ruby/2.5.0/gems/rake-12.3.1/exe/rake:27:in `<top (required)>'
/home/marvin/.rbenv/versions/2.5.1/bin/bundle:23:in `load'
/home/marvin/.rbenv/versions/2.5.1/bin/bundle:23:in `<main>'
Tasks: TOP => assets:precompile
(See full trace by running task with --trace)
编辑：我的yarn.lock文件如下所示：
# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
# yarn lockfile v1
实际上，我什么都不用使用yarn，因为Rails决定默认使用它，所以我忍受了。我很高兴我们可以永久删除它，并消除上面的错误。
答案 0 :(得分：2)
好像您的部署服务器中没有安装yarn。您已经安装了吗？如果没有，请在重新部署之前尝试以下命令：
npm install yarn -g