我正在上Ruby on Rails课程，并且试图将应用程序推送到Heroku。我搜索过有关此问题的较旧StackOverflow帖子，但这些建议对我来说都不起作用。以下是我尝试的日志。我将不胜感激。谢谢。
有人告诉我要添加更多文本。主要错误似乎是：
“预编译资产失败”
“预接收钩被拒绝”
ID 52540144-6b6d-4959-95a0-b9350d45a774
! Warning: Multiple default buildpacks reported the ability to handle this app. The first buildpack in the list below will be used.
Detected buildpacks: Ruby,Node.js
See https://devcenter.heroku.com/articles/buildpacks#buildpack-detect-order
-----> Ruby app detected
-----> Compiling Ruby/Rails
-----> Using Ruby version: ruby-2.5.1
-----> Installing dependencies using bundler 1.15.2
Running: bundle install --without development:test --path vendor/bundle --binstubs vendor/bundle/bin -j4 --deployment
Warning: the running version of Bundler (1.15.2) is older than the version that created the lockfile (1.16.5). We suggest you upgrade to the latest version of Bundler by running `gem install bundler`.
Fetching gem metadata from https://rubygems.org/.........
Fetching version metadata from https://rubygems.org/..
Fetching dependency metadata from https://rubygems.org/.
Fetching rake 12.3.1
Fetching concurrent-ruby 1.0.5
Fetching minitest 5.11.3
Installing minitest 5.11.3
Installing concurrent-ruby 1.0.5
Installing rake 12.3.1
Fetching thread_safe 0.3.6
Installing thread_safe 0.3.6
Fetching builder 3.2.3
Installing builder 3.2.3
Fetching erubi 1.7.1
Installing erubi 1.7.1
Fetching mini_portile2 2.3.0
Installing mini_portile2 2.3.0
Fetching crass 1.0.4
Installing crass 1.0.4
Fetching rack 2.0.5
Fetching nio4r 2.3.1
Installing nio4r 2.3.1 with native extensions
Installing rack 2.0.5
Fetching websocket-extensions 0.1.3
Installing websocket-extensions 0.1.3
Fetching mini_mime 1.0.1
Installing mini_mime 1.0.1
Fetching arel 9.0.0
Installing arel 9.0.0
Fetching mimemagic 0.3.2
Fetching execjs 2.7.0
Installing execjs 2.7.0
Fetching msgpack 1.2.4
Installing mimemagic 0.3.2
Installing msgpack 1.2.4 with native extensions
Fetching popper_js 1.14.3
Installing popper_js 1.14.3
Fetching rb-fsevent 0.10.3
Installing rb-fsevent 0.10.3
Fetching ffi 1.9.25
Installing ffi 1.9.25 with native extensions
Using bundler 1.15.2
Fetching coffee-script-source 1.12.2
Installing coffee-script-source 1.12.2
Fetching method_source 0.9.0
Installing method_source 0.9.0
Fetching thor 0.20.0
Installing thor 0.20.0
Fetching multi_json 1.13.1
Installing multi_json 1.13.1
Fetching pg 1.1.3
Installing pg 1.1.3 with native extensions
Fetching puma 3.12.0
Installing puma 3.12.0 with native extensions
Fetching tilt 2.0.8
Installing tilt 2.0.8
Fetching turbolinks-source 5.2.0
Installing turbolinks-source 5.2.0
Fetching tzinfo 1.2.5
Installing tzinfo 1.2.5
Fetching i18n 1.1.1
Installing i18n 1.1.1
Fetching nokogiri 1.8.5
Installing nokogiri 1.8.5 with native extensions
Fetching websocket-driver 0.7.0
Installing websocket-driver 0.7.0 with native extensions
Fetching mail 2.7.1
Installing mail 2.7.1
Fetching rack-test 1.1.0
Installing rack-test 1.1.0
Fetching sprockets 3.7.2
Installing sprockets 3.7.2
Fetching autoprefixer-rails 9.3.1
Installing autoprefixer-rails 9.3.1
Fetching uglifier 4.1.19
Installing uglifier 4.1.19
Fetching marcel 0.3.3
Installing marcel 0.3.3
Fetching coffee-script 2.4.1
Installing coffee-script 2.4.1
Fetching bootsnap 1.3.2
Installing bootsnap 1.3.2 with native extensions
Fetching rb-inotify 0.9.10
Installing rb-inotify 0.9.10
Fetching turbolinks 5.2.0
Installing turbolinks 5.2.0
Fetching activesupport 5.2.1
Installing activesupport 5.2.1
Fetching loofah 2.2.3
Installing loofah 2.2.3
Fetching sass-listen 4.0.0
Installing sass-listen 4.0.0
Fetching rails-dom-testing 2.0.3
Installing rails-dom-testing 2.0.3
Fetching globalid 0.4.1
Installing globalid 0.4.1
Fetching activemodel 5.2.1
Fetching jbuilder 2.7.0
Installing activemodel 5.2.1
Installing jbuilder 2.7.0
Fetching rails-html-sanitizer 1.0.4
Installing rails-html-sanitizer 1.0.4
Fetching sass 3.6.0
Fetching activejob 5.2.1
Installing activejob 5.2.1
Installing sass 3.6.0
Fetching activerecord 5.2.1
Fetching actionview 5.2.1
Installing activerecord 5.2.1
Installing actionview 5.2.1
Fetching actionpack 5.2.1
Installing actionpack 5.2.1
Fetching bootstrap 4.1.3
Installing bootstrap 4.1.3
Fetching bootstrap-sass 3.3.7
Installing bootstrap-sass 3.3.7
Fetching actioncable 5.2.1
Installing actioncable 5.2.1
Fetching actionmailer 5.2.1
Installing actionmailer 5.2.1
Fetching activestorage 5.2.1
Installing activestorage 5.2.1
Fetching railties 5.2.1
Installing railties 5.2.1
Fetching sprockets-rails 3.2.1
Installing sprockets-rails 3.2.1
Fetching jquery-rails 4.3.3
Fetching coffee-rails 4.2.2
Fetching rails 5.2.1
Installing coffee-rails 4.2.2
Installing rails 5.2.1
Fetching sass-rails 5.0.7
Installing sass-rails 5.0.7
Installing jquery-rails 4.3.3
Bundle complete! 19 Gemfile dependencies, 66 gems now installed.
Gems in the groups development and test were not installed.
Bundled gems are installed into ./vendor/bundle.
Post-install message from sass:
Ruby Sass is deprecated and will be unmaintained as of 26 March 2019.
* If you use Sass as a command-line tool, we recommend using Dart Sass, the new
primary implementation: https://sass-lang.com/install
* If you use Sass as a plug-in for a Ruby web framework, we recommend using the
sassc gem: https://github.com/sass/sassc-ruby#readme
* For more details, please refer to the Sass blog:
http://sass.logdown.com/posts/7081811
Bundle completed (47.12s)
Cleaning up the bundler cache.
Warning: the running version of Bundler (1.15.2) is older than the version that created the lockfile (1.16.5). We suggest you upgrade to the latest version of Bundler by running `gem install bundler`.
The latest bundler is 1.17.1, but you are currently running 1.15.2.
To update, run `gem install bundler`
-----> Installing node-v8.10.0-linux-x64
-----> Detecting rake tasks
-----> Preparing app for Rails asset pipeline
Running: rake assets:precompile
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/bootstrap-sass-3.3.7/lib/bootstrap-sass/version.rb:2: warning: already initialized constant Bootstrap::VERSION
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/bootstrap-4.1.3/lib/bootstrap/version.rb:2: warning: previous definition of VERSION was here
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/bootstrap-sass-3.3.7/lib/bootstrap-sass/version.rb:3: warning: already initialized constant Bootstrap::BOOTSTRAP_SHA
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/bootstrap-4.1.3/lib/bootstrap/version.rb:3: warning: previous definition of BOOTSTRAP_SHA was here
Yarn executable was not detected in the system.
Download Yarn at https://yarnpkg.com/en/docs/install
I, [2018-10-31T14:05:58.213666 #1419] INFO -- : Writing /tmp/build_d87edff4795e58683aa5e3626de5a3f7/public/assets/bicycle-b0065f34bb7db6b7b0a5cf8d177e85276f69b39e791b5fd72a245e8b90e0cc43.jpg
I, [2018-10-31T14:06:05.048362 #1419] INFO -- : Writing /tmp/build_d87edff4795e58683aa5e3626de5a3f7/public/assets/application-b2b98178b68108062edcf84d640b496d914a3dab78c660f799ab4c8a54064fcd.js
I, [2018-10-31T14:06:05.048648 #1419] INFO -- : Writing /tmp/build_d87edff4795e58683aa5e3626de5a3f7/public/assets/application-b2b98178b68108062edcf84d640b496d914a3dab78c660f799ab4c8a54064fcd.js.gz
rake aborted!
Sass::SyntaxError: File to import not found or unreadable: bootstrap-sprockets.
Load paths:
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/bootstrap-4.1.3/assets/stylesheets
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/bootstrap-4.1.3/assets/stylesheets
(sass):1
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sass-3.6.0/lib/sass/tree/import_node.rb:67:in `rescue in import'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sass-3.6.0/lib/sass/tree/import_node.rb:44:in `import'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sass-3.6.0/lib/sass/tree/import_node.rb:28:in `imported_file'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sass-3.6.0/lib/sass/tree/import_node.rb:37:in `css_import?'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sass-3.6.0/lib/sass/tree/visitors/perform.rb:310:in `visit_import'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sass-3.6.0/lib/sass/tree/visitors/base.rb:36:in `visit'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sass-3.6.0/lib/sass/tree/visitors/perform.rb:158:in `block in visit'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sass-3.6.0/lib/sass/stack.rb:79:in `block in with_base'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sass-3.6.0/lib/sass/stack.rb:135:in `with_frame'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sass-3.6.0/lib/sass/stack.rb:79:in `with_base'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sass-3.6.0/lib/sass/tree/visitors/perform.rb:158:in `visit'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sass-3.6.0/lib/sass/tree/visitors/base.rb:52:in `block in visit_children'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sass-3.6.0/lib/sass/tree/visitors/base.rb:52:in `map'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sass-3.6.0/lib/sass/tree/visitors/base.rb:52:in `visit_children'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sass-3.6.0/lib/sass/tree/visitors/perform.rb:167:in `block in visit_children'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sass-3.6.0/lib/sass/tree/visitors/perform.rb:179:in `with_environment'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sass-3.6.0/lib/sass/tree/visitors/perform.rb:166:in `visit_children'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sass-3.6.0/lib/sass/tree/visitors/base.rb:36:in `block in visit'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sass-3.6.0/lib/sass/tree/visitors/perform.rb:186:in `visit_root'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sass-3.6.0/lib/sass/tree/visitors/base.rb:36:in `visit'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sass-3.6.0/lib/sass/tree/visitors/perform.rb:157:in `visit'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sass-3.6.0/lib/sass/tree/visitors/perform.rb:10:in `visit'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sass-3.6.0/lib/sass/tree/root_node.rb:36:in `css_tree'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sass-3.6.0/lib/sass/tree/root_node.rb:20:in `render'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sass-3.6.0/lib/sass/engine.rb:290:in `render'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/sass_compressor.rb:48:in `call'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/sass_compressor.rb:28:in `call'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/processor_utils.rb:75:in `call_processor'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/processor_utils.rb:57:in `block in call_processors'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/processor_utils.rb:56:in `reverse_each'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/processor_utils.rb:56:in `call_processors'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/loader.rb:134:in `load_from_unloaded'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/loader.rb:60:in `block in load'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/loader.rb:317:in `fetch_asset_from_dependency_cache'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/loader.rb:44:in `load'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/cached_environment.rb:20:in `block in initialize'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/cached_environment.rb:47:in `load'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/base.rb:66:in `find_asset'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/base.rb:73:in `find_all_linked_assets'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/manifest.rb:142:in `block in find'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/legacy.rb:114:in `block (2 levels) in logical_paths'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/path_utils.rb:228:in `block in stat_tree'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/path_utils.rb:212:in `block in stat_directory'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/path_utils.rb:209:in `each'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/path_utils.rb:209:in `stat_directory'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/path_utils.rb:227:in `stat_tree'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/legacy.rb:105:in `each'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/legacy.rb:105:in `block in logical_paths'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/legacy.rb:104:in `each'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/legacy.rb:104:in `logical_paths'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/manifest.rb:140:in `find'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/manifest.rb:186:in `compile'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sprockets-rails-3.2.1/lib/sprockets/rails/task.rb:68:in `block (3 levels) in define'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/rake/sprocketstask.rb:147:in `with_logger'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sprockets-rails-3.2.1/lib/sprockets/rails/task.rb:67:in `block (2 levels) in define'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/rake-12.3.1/exe/rake:27:in `<top (required)>'
Caused by:
Sass::SyntaxError: File to import not found or unreadable: bootstrap-sprockets.
Load paths:
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/bootstrap-4.1.3/assets/stylesheets
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/bootstrap-4.1.3/assets/stylesheets
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sass-3.6.0/lib/sass/tree/import_node.rb:65:in `import'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sass-3.6.0/lib/sass/tree/import_node.rb:28:in `imported_file'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sass-3.6.0/lib/sass/tree/import_node.rb:37:in `css_import?'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sass-3.6.0/lib/sass/tree/visitors/perform.rb:310:in `visit_import'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sass-3.6.0/lib/sass/tree/visitors/base.rb:36:in `visit'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sass-3.6.0/lib/sass/tree/visitors/perform.rb:158:in `block in visit'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sass-3.6.0/lib/sass/stack.rb:79:in `block in with_base'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sass-3.6.0/lib/sass/stack.rb:135:in `with_frame'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sass-3.6.0/lib/sass/stack.rb:79:in `with_base'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sass-3.6.0/lib/sass/tree/visitors/perform.rb:158:in `visit'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sass-3.6.0/lib/sass/tree/visitors/base.rb:52:in `block in visit_children'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sass-3.6.0/lib/sass/tree/visitors/base.rb:52:in `map'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sass-3.6.0/lib/sass/tree/visitors/base.rb:52:in `visit_children'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sass-3.6.0/lib/sass/tree/visitors/perform.rb:167:in `block in visit_children'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sass-3.6.0/lib/sass/tree/visitors/perform.rb:179:in `with_environment'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sass-3.6.0/lib/sass/tree/visitors/perform.rb:166:in `visit_children'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sass-3.6.0/lib/sass/tree/visitors/base.rb:36:in `block in visit'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sass-3.6.0/lib/sass/tree/visitors/perform.rb:186:in `visit_root'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sass-3.6.0/lib/sass/tree/visitors/base.rb:36:in `visit'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sass-3.6.0/lib/sass/tree/visitors/perform.rb:157:in `visit'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sass-3.6.0/lib/sass/tree/visitors/perform.rb:10:in `visit'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sass-3.6.0/lib/sass/tree/root_node.rb:36:in `css_tree'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sass-3.6.0/lib/sass/tree/root_node.rb:20:in `render'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sass-3.6.0/lib/sass/engine.rb:290:in `render'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/sass_compressor.rb:48:in `call'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/sass_compressor.rb:28:in `call'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/processor_utils.rb:75:in `call_processor'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/processor_utils.rb:57:in `block in call_processors'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/processor_utils.rb:56:in `reverse_each'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/processor_utils.rb:56:in `call_processors'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/loader.rb:134:in `load_from_unloaded'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/loader.rb:60:in `block in load'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/loader.rb:317:in `fetch_asset_from_dependency_cache'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/loader.rb:44:in `load'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/cached_environment.rb:20:in `block in initialize'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/cached_environment.rb:47:in `load'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/base.rb:66:in `find_asset'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/base.rb:73:in `find_all_linked_assets'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/manifest.rb:142:in `block in find'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/legacy.rb:114:in `block (2 levels) in logical_paths'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/path_utils.rb:228:in `block in stat_tree'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/path_utils.rb:212:in `block in stat_directory'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/path_utils.rb:209:in `each'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/path_utils.rb:209:in `stat_directory'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/path_utils.rb:227:in `stat_tree'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/legacy.rb:105:in `each'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/legacy.rb:105:in `block in logical_paths'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/legacy.rb:104:in `each'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/legacy.rb:104:in `logical_paths'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/manifest.rb:140:in `find'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/manifest.rb:186:in `compile'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sprockets-rails-3.2.1/lib/sprockets/rails/task.rb:68:in `block (3 levels) in define'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/rake/sprocketstask.rb:147:in `with_logger'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/sprockets-rails-3.2.1/lib/sprockets/rails/task.rb:67:in `block (2 levels) in define'
/tmp/build_d87edff4795e58683aa5e3626de5a3f7/vendor/bundle/ruby/2.5.0/gems/rake-12.3.1/exe/rake:27:in `<top (required)>'
Tasks: TOP => assets:precompile
(See full trace by running task with --trace)
!
! Precompiling assets failed.
!
! Push rejected, failed to compile Ruby app.
! Push failed
答案 0 :(得分：0)
Rails 2.0 +
这是因为您使用的是bootstrap-sprockets，但没有安装bootstrap-sass gem。
基本上将以下内容添加到您的Gemfile中：
gem 'bootstrap-sass', '~> 3.3.7'
gem 'sass-rails', '>= 3.2'
然后将变量导入您的app/assets/stylesheets/application.scss：
// "bootstrap-sprockets" must be imported before "bootstrap" and "bootstrap/variables"
@import "bootstrap-sprockets";
@import "bootstrap";
最后，如果您使用的是scss，则需要将所有*= require_self和*= require_tree更改为@import才能导入Sass文件。您可以在这里找到更详细的安装说明：https://github.com/twbs/bootstrap-sass
Rails 4.0 +
有关较新版本的rails，请遵循以下文档：https://github.com/twbs/bootstrap-rubygem#a-ruby-on-rails
gem 'bootstrap', '~> 4.1.3'添加到您的Gemfile @import "bootstrap";添加到您的app/assets/stylesheets/application.scss *= require和*= require_tree语句，而是使用@import gem 'jquery-rails'添加到您的Gemfile