当我通过Cloud 9上的Shell启动应用程序时，即使该应用程序运行正常，我仍在尝试推送至Heroku时收到以下日志文件：
remote: Compressing source files... done.
remote: Building source:
remote:
remote: -----> Ruby app detected
remote: -----> Compiling Ruby/Rails
remote: -----> Using Ruby version: ruby-2.4.4
remote: -----> Installing dependencies using bundler 1.15.2
remote: Running: bundle install --without development:test --path vendor/bundle --binstubs vendor/bundle/bin -j4 --deployment
remote: Warning: the running version of Bundler (1.15.2) is older than the version that created the lockfile (1.16.4). We suggest you upgrade to the latest version of Bundler by running `gem install bundler`.
remote: Fetching gem metadata from https://rubygems.org/.........
remote: Fetching version metadata from https://rubygems.org/..
remote: Fetching dependency metadata from https://rubygems.org/.
remote: Using rake 12.3.1
remote: Using concurrent-ruby 1.0.5
remote: Using minitest 5.10.3
remote: Using thread_safe 0.3.6
remote: Using builder 3.2.3
remote: Using erubi 1.7.1
remote: Using mini_portile2 2.3.0
remote: Using crass 1.0.4
remote: Using rack 2.0.5
remote: Using nio4r 2.3.1
remote: Using websocket-extensions 0.1.3
remote: Using mini_mime 1.0.1
remote: Using arel 8.0.0
remote: Using execjs 2.7.0
remote: Using popper_js 1.14.3
remote: Using rb-fsevent 0.10.3
remote: Using ffi 1.9.25
remote: Using bundler 1.15.2
remote: Using method_source 0.9.0
remote: Using thor 0.20.0
remote: Using coffee-script-source 1.12.2
remote: Using multi_json 1.13.1
remote: Using pg 0.18.4
remote: Using puma 3.9.1
remote: Using tilt 2.0.8
remote: Using turbolinks-source 5.2.0
remote: Using i18n 1.1.0
remote: Using tzinfo 1.2.5
remote: Using nokogiri 1.8.4
remote: Using rack-test 1.1.0
remote: Using sprockets 3.7.2
remote: Using websocket-driver 0.6.5
remote: Using autoprefixer-rails 9.1.4
remote: Using uglifier 3.2.0
remote: Using mail 2.7.0
remote: Using rb-inotify 0.9.10
remote: Using coffee-script 2.4.1
remote: Using turbolinks 5.0.1
remote: Using activesupport 5.1.6
remote: Using loofah 2.2.2
remote: Using sass-listen 4.0.0
remote: Using rails-dom-testing 2.0.3
remote: Using globalid 0.4.1
remote: Using activemodel 5.1.6
remote: Using jbuilder 2.7.0
remote: Using rails-html-sanitizer 1.0.4
remote: Using sass 3.6.0
remote: Using activejob 5.1.6
remote: Using activerecord 5.1.6
remote: Using actionview 5.1.6
remote: Using bootstrap 4.1.3
remote: Using actionpack 5.1.6
remote: Using actioncable 5.1.6
remote: Using actionmailer 5.1.6
remote: Using railties 5.1.6
remote: Using sprockets-rails 3.2.1
remote: Using coffee-rails 4.2.2
remote: Using jquery-rails 4.3.1
remote: Using rails 5.1.6
remote: Using sass-rails 5.0.6
remote: Using bootstrap_form 4.0.0.alpha1
remote: Bundle complete! 23 Gemfile dependencies, 61 gems now installed.
remote: Gems in the groups development and test were not installed.
remote: Bundled gems are installed into ./vendor/bundle.
remote: Bundle completed (3.06s)
remote: Cleaning up the bundler cache.
remote: Warning: the running version of Bundler (1.15.2) is older than the version that created the lockfile (1.16.4). We suggest you upgrade to the latest version of Bundler by running `gem install bundler`.
remote: The latest bundler is 1.17.0.pre.1, but you are currently running 1.15.2.
remote: To update, run `gem install bundler --pre`
remote: -----> Installing node-v8.10.0-linux-x64
remote: -----> Detecting rake tasks
remote: -----> Preparing app for Rails asset pipeline
remote: Running: rake assets:precompile
remote: Yarn executable was not detected in the system.
remote: Download Yarn at https://yarnpkg.com/en/docs/install
remote: I, [2018-10-03T09:12:18.142230 #384] INFO -- : Writing /tmp/build_12dabe8ded8a8b689b0a385e82947a02/public/assets/FontAwesome-ecd72f31910a8ee2726fd17bd459be26f230779f3f3ed5f69ebf829e4b12e768.otf
remote: I, [2018-10-03T09:12:18.143259 #384] INFO -- : Writing /tmp/build_12dabe8ded8a8b689b0a385e82947a02/public/assets/FontAwesome-ecd72f31910a8ee2726fd17bd459be26f230779f3f3ed5f69ebf829e4b12e768.otf.gz
remote: I, [2018-10-03T09:12:18.146824 #384] INFO -- : Writing /tmp/build_12dabe8ded8a8b689b0a385e82947a02/public/assets/fontawesome-webfont-50bbe9192697e791e2ee4ef73917aeb1b03e727dff08a1fc8d74f00e4aa812e1.eot
remote: I, [2018-10-03T09:12:18.147645 #384] INFO -- : Writing /tmp/build_12dabe8ded8a8b689b0a385e82947a02/public/assets/fontawesome-webfont-50bbe9192697e791e2ee4ef73917aeb1b03e727dff08a1fc8d74f00e4aa812e1.eot.gz
remote: I, [2018-10-03T09:12:18.155999 #384] INFO -- : Writing /tmp/build_12dabe8ded8a8b689b0a385e82947a02/public/assets/fontawesome-webfont-8e3586389bb4cd01b3f85bb3b622739bde6627f28bba63a020c223ca9cf1b9ae.svg
remote: I, [2018-10-03T09:12:18.156816 #384] INFO -- : Writing /tmp/build_12dabe8ded8a8b689b0a385e82947a02/public/assets/fontawesome-webfont-8e3586389bb4cd01b3f85bb3b622739bde6627f28bba63a020c223ca9cf1b9ae.svg.gz
remote: I, [2018-10-03T09:12:18.161253 #384] INFO -- : Writing /tmp/build_12dabe8ded8a8b689b0a385e82947a02/public/assets/fontawesome-webfont-ae19e2e4c04f2b04bf030684c4c1db8faf5c8fe3ee03d1e0c409046608b38912.ttf
remote: I, [2018-10-03T09:12:18.162158 #384] INFO -- : Writing /tmp/build_12dabe8ded8a8b689b0a385e82947a02/public/assets/fontawesome-webfont-ae19e2e4c04f2b04bf030684c4c1db8faf5c8fe3ee03d1e0c409046608b38912.ttf.gz
remote: I, [2018-10-03T09:12:18.171358 #384] INFO -- : Writing /tmp/build_12dabe8ded8a8b689b0a385e82947a02/public/assets/fontawesome-webfont-adbc4f95eb6d7f2738959cf0ecbc374672fce47e856050a8e9791f457623ac2c.woff
remote: I, [2018-10-03T09:12:18.178232 #384] INFO -- : Writing /tmp/build_12dabe8ded8a8b689b0a385e82947a02/public/assets/fontawesome-webfont-7dacf83f51179de8d7980a513e67ab3a08f2c6272bb5946df8fd77c0d1763b73.woff2
remote: I, [2018-10-03T09:12:18.180823 #384] INFO -- : Writing /tmp/build_12dabe8ded8a8b689b0a385e82947a02/public/assets/glyphicons-halflings-regular-13634da87d9e23f8c3ed9108ce1724d183a39ad072e73e1b3d8cbf646d2d0407.eot
remote: I, [2018-10-03T09:12:18.181403 #384] INFO -- : Writing /tmp/build_12dabe8ded8a8b689b0a385e82947a02/public/assets/glyphicons-halflings-regular-13634da87d9e23f8c3ed9108ce1724d183a39ad072e73e1b3d8cbf646d2d0407.eot.gz
remote: I, [2018-10-03T09:12:18.185251 #384] INFO -- : Writing /tmp/build_12dabe8ded8a8b689b0a385e82947a02/public/assets/glyphicons-halflings-regular-42f60659d265c1a3c30f9fa42abcbb56bd4a53af4d83d316d6dd7a36903c43e5.svg
remote: I, [2018-10-03T09:12:18.185519 #384] INFO -- : Writing /tmp/build_12dabe8ded8a8b689b0a385e82947a02/public/assets/glyphicons-halflings-regular-42f60659d265c1a3c30f9fa42abcbb56bd4a53af4d83d316d6dd7a36903c43e5.svg.gz
remote: I, [2018-10-03T09:12:18.187944 #384] INFO -- : Writing /tmp/build_12dabe8ded8a8b689b0a385e82947a02/public/assets/glyphicons-halflings-regular-e395044093757d82afcb138957d06a1ea9361bdcf0b442d06a18a8051af57456.ttf
remote: I, [2018-10-03T09:12:18.188205 #384] INFO -- : Writing /tmp/build_12dabe8ded8a8b689b0a385e82947a02/public/assets/glyphicons-halflings-regular-e395044093757d82afcb138957d06a1ea9361bdcf0b442d06a18a8051af57456.ttf.gz
remote: I, [2018-10-03T09:12:18.191454 #384] INFO -- : Writing /tmp/build_12dabe8ded8a8b689b0a385e82947a02/public/assets/glyphicons-halflings-regular-a26394f7ede100ca118eff2eda08596275a9839b959c226e15439557a5a80742.woff
remote: I, [2018-10-03T09:12:18.194453 #384] INFO -- : Writing /tmp/build_12dabe8ded8a8b689b0a385e82947a02/public/assets/glyphicons-halflings-regular-fe185d11a49676890d47bb783312a0cda5a44c4039214094e7957b4c040ef11c.woff2
remote: I, [2018-10-03T09:12:18.203703 #384] INFO -- : Writing /tmp/build_12dabe8ded8a8b689b0a385e82947a02/public/assets/icofont-e4cbd1671344845acbca57717d36b47677d9bb3d083f733ae10b9465d94a7762.eot
remote: I, [2018-10-03T09:12:18.211381 #384] INFO -- : Writing /tmp/build_12dabe8ded8a8b689b0a385e82947a02/public/assets/icofont-e4cbd1671344845acbca57717d36b47677d9bb3d083f733ae10b9465d94a7762.eot.gz
remote: I, [2018-10-03T09:12:18.283967 #384] INFO -- : Writing /tmp/build_12dabe8ded8a8b689b0a385e82947a02/public/assets/icofont-667f31ea1b0f726e62ca628f730aa94d25b7e408886962233387ff5ed9541638.svg
remote: I, [2018-10-03T09:12:18.354445 #384] INFO -- : Writing /tmp/build_12dabe8ded8a8b689b0a385e82947a02/public/assets/icofont-667f31ea1b0f726e62ca628f730aa94d25b7e408886962233387ff5ed9541638.svg.gz
remote: I, [2018-10-03T09:12:18.399102 #384] INFO -- : Writing /tmp/build_12dabe8ded8a8b689b0a385e82947a02/public/assets/icofont-ac2e76e07a7208cc4c0f7afb773a89a314c4d13bf7f6def920ad50817e6ba735.ttf
remote: I, [2018-10-03T09:12:18.402251 #384] INFO -- : Writing /tmp/build_12dabe8ded8a8b689b0a385e82947a02/public/assets/icofont-ac2e76e07a7208cc4c0f7afb773a89a314c4d13bf7f6def920ad50817e6ba735.ttf.gz
remote: I, [2018-10-03T09:12:18.417501 #384] INFO -- : Writing /tmp/build_12dabe8ded8a8b689b0a385e82947a02/public/assets/icofont-00f9608b3cbbb28d65eca172de8b338e505e76c228ca385e25f3f6784e29552c.woff
remote: I, [2018-10-03T09:12:18.439650 #384] INFO -- : Writing /tmp/build_12dabe8ded8a8b689b0a385e82947a02/public/assets/footer-bg-dafa00f60bd0f41505cbdecb70a629b5f08e682d3ac2c86a6366c6ad3b369d0e.jpg
remote: I, [2018-10-03T09:12:18.450314 #384] INFO -- : Writing /tmp/build_12dabe8ded8a8b689b0a385e82947a02/public/assets/hand-mockup-581076b7c0893772e9759a46fb5d989e8a1454389c606f3b04c7762450b8e0a5.png
remote: I, [2018-10-03T09:12:18.454120 #384] INFO -- : Writing /tmp/build_12dabe8ded8a8b689b0a385e82947a02/public/assets/loader-bef56aeeae1ddf3cf1a282a73f84d7a0a33b2b3fc2104f9c169bb8a8c05e5a32.gif
remote: I, [2018-10-03T09:12:18.461330 #384] INFO -- : Writing /tmp/build_12dabe8ded8a8b689b0a385e82947a02/public/assets/logo-3d7e2c3ed22e51603ebdf03572ac74b9d966e327fe2f196d5a6a701555113163.png
remote: I, [2018-10-03T09:12:18.464691 #384] INFO -- : Writing /tmp/build_12dabe8ded8a8b689b0a385e82947a02/public/assets/showcase-89c921bf383a4dc538f3629fbf6ab3a31a748539b349581d4458794ba455ec30.png
remote: I, [2018-10-03T09:12:18.471609 #384] INFO -- : Writing /tmp/build_12dabe8ded8a8b689b0a385e82947a02/public/assets/showcase2-3592117095ec5c8714c5b4c4e5b0c5230822f80d4e991b7308609194b825b03e.png
remote: I, [2018-10-03T09:12:22.991915 #384] INFO -- : Writing /tmp/build_12dabe8ded8a8b689b0a385e82947a02/public/assets/application-b10a17f71861db0a548cebad3165cf93d24b4d23401df4869e6d7b6c053b36a5.js
remote: I, [2018-10-03T09:12:22.992699 #384] INFO -- : Writing /tmp/build_12dabe8ded8a8b689b0a385e82947a02/public/assets/application-b10a17f71861db0a548cebad3165cf93d24b4d23401df4869e6d7b6c053b36a5.js.gz
remote: rake aborted!
remote: NoMethodError: undefined method `[]' for nil:NilClass
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sprockets-3.7.2/lib/sprockets/sass_processor.rb:278:in `sprockets_context'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sprockets-3.7.2/lib/sprockets/sass_processor.rb:124:in `asset_path'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sprockets-3.7.2/lib/sprockets/sass_processor.rb:137:in `asset_url'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sprockets-3.7.2/lib/sprockets/sass_processor.rb:209:in `font_url'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sass-3.6.0/lib/sass/script/tree/funcall.rb:151:in `block in _perform'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sass-3.6.0/lib/sass/stack.rb:108:in `block in with_function'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sass-3.6.0/lib/sass/stack.rb:135:in `with_frame'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sass-3.6.0/lib/sass/stack.rb:108:in `with_function'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sass-3.6.0/lib/sass/script/tree/funcall.rb:149:in `_perform'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sass-3.6.0/lib/sass/script/tree/node.rb:50:in `perform'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sass-3.6.0/lib/sass/tree/visitors/perform.rb:398:in `visit_prop'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sass-3.6.0/lib/sass/tree/visitors/base.rb:36:in `visit'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sass-3.6.0/lib/sass/tree/visitors/perform.rb:158:in `block in visit'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sass-3.6.0/lib/sass/stack.rb:79:in `block in with_base'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sass-3.6.0/lib/sass/stack.rb:135:in `with_frame'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sass-3.6.0/lib/sass/stack.rb:79:in `with_base'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sass-3.6.0/lib/sass/tree/visitors/perform.rb:158:in `visit'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sass-3.6.0/lib/sass/tree/visitors/perform.rb:513:in `block (2 levels) in visit_directive'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sass-3.6.0/lib/sass/tree/visitors/perform.rb:513:in `map'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sass-3.6.0/lib/sass/tree/visitors/perform.rb:513:in `block in visit_directive'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sass-3.6.0/lib/sass/tree/visitors/perform.rb:179:in `with_environment'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sass-3.6.0/lib/sass/tree/visitors/perform.rb:512:in `visit_directive'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sass-3.6.0/lib/sass/tree/visitors/base.rb:36:in `visit'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sass-3.6.0/lib/sass/tree/visitors/perform.rb:158:in `block in visit'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sass-3.6.0/lib/sass/stack.rb:79:in `block in with_base'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sass-3.6.0/lib/sass/stack.rb:135:in `with_frame'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sass-3.6.0/lib/sass/stack.rb:79:in `with_base'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sass-3.6.0/lib/sass/tree/visitors/perform.rb:158:in `visit'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sass-3.6.0/lib/sass/tree/visitors/base.rb:52:in `block in visit_children'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sass-3.6.0/lib/sass/tree/visitors/base.rb:52:in `map'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sass-3.6.0/lib/sass/tree/visitors/base.rb:52:in `visit_children'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sass-3.6.0/lib/sass/tree/visitors/perform.rb:167:in `block in visit_children
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sass-3.6.0/lib/sass/tree/visitors/perform.rb:179:in `with_environment'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sass-3.6.0/lib/sass/tree/visitors/perform.rb:166:in `visit_children'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sass-3.6.0/lib/sass/tree/visitors/base.rb:36:in `block in visit'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sass-3.6.0/lib/sass/tree/visitors/perform.rb:186:in `visit_root'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sass-3.6.0/lib/sass/tree/visitors/base.rb:36:in `visit'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sass-3.6.0/lib/sass/tree/visitors/perform.rb:157:in `visit'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sass-3.6.0/lib/sass/tree/visitors/perform.rb:10:in `visit'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sass-3.6.0/lib/sass/tree/root_node.rb:36:in `css_tree'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sass-3.6.0/lib/sass/tree/root_node.rb:20:in `render'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sass-3.6.0/lib/sass/engine.rb:290:in `render'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sprockets-3.7.2/lib/sprockets/sass_compressor.rb:48:in `call'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sprockets-3.7.2/lib/sprockets/sass_compressor.rb:28:in `call'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sprockets-3.7.2/lib/sprockets/processor_utils.rb:75:in `call_processor'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sprockets-3.7.2/lib/sprockets/processor_utils.rb:57:in `block in call_processors'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sprockets-3.7.2/lib/sprockets/processor_utils.rb:56:in `reverse_each'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sprockets-3.7.2/lib/sprockets/processor_utils.rb:56:in `call_processors'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sprockets-3.7.2/lib/sprockets/loader.rb:134:in `load_from_unloaded'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sprockets-3.7.2/lib/sprockets/loader.rb:60:in `block in load'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sprockets-3.7.2/lib/sprockets/loader.rb:317:in `fetch_asset_from_dependency_cache'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sprockets-3.7.2/lib/sprockets/loader.rb:44:in `load'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sprockets-3.7.2/lib/sprockets/cached_environment.rb:20:in `block in initialize'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sprockets-3.7.2/lib/sprockets/cached_environment.rb:47:in `load'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sprockets-3.7.2/lib/sprockets/base.rb:66:in `find_asset'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sprockets-3.7.2/lib/sprockets/base.rb:73:in `find_all_linked_assets'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sprockets-3.7.2/lib/sprockets/manifest.rb:142:in `block in find'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sprockets-3.7.2/lib/sprockets/legacy.rb:114:in `block (2 levels) in logical_paths'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sprockets-3.7.2/lib/sprockets/path_utils.rb:228:in `block in stat_tree'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sprockets-3.7.2/lib/sprockets/path_utils.rb:212:in `block in stat_directory'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sprockets-3.7.2/lib/sprockets/path_utils.rb:209:in `each'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sprockets-3.7.2/lib/sprockets/path_utils.rb:209:in `stat_directory'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sprockets-3.7.2/lib/sprockets/path_utils.rb:227:in `stat_tree'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sprockets-3.7.2/lib/sprockets/legacy.rb:105:in `each'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sprockets-3.7.2/lib/sprockets/legacy.rb:105:in `block in logical_paths'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sprockets-3.7.2/lib/sprockets/legacy.rb:104:in `each'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sprockets-3.7.2/lib/sprockets/legacy.rb:104:in `logical_paths'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sprockets-3.7.2/lib/sprockets/manifest.rb:140:in `find'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sprockets-3.7.2/lib/sprockets/manifest.rb:186:in `compile'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sprockets-rails-3.2.1/lib/sprockets/rails/task.rb:68:in `block (3 levels) in define'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sprockets-3.7.2/lib/rake/sprocketstask.rb:147:in `with_logger'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/sprockets-rails-3.2.1/lib/sprockets/rails/task.rb:67:in `block (2 levels) in define'
remote: /tmp/build_12dabe8ded8a8b689b0a385e82947a02/vendor/bundle/ruby/2.4.0/gems/rake-12.3.1/exe/rake:27:in `<top (required)>'
remote: Tasks: TOP => assets:precompile
remote: (See full trace by running task with --trace)
remote:
remote: !
remote: ! Precompiling assets failed.
remote: !
remote: ! Push rejected, failed to compile Ruby app.
remote:
remote: ! Push failed
remote: Verifying deploy...
remote:
我相信remote: NoMethodError: undefined method '[]' for nil:NilClass是此错误的最重要部分。
我已经尝试了网站上其他答案中的几项措施，但无济于事。
例如将config.assets.initialize_on_precompile = false添加到我的config/application.rb文件中。
在尝试推送到Heroku之前，我尝试在本地编译资产，但是我收到了相同的错误。
我注意到许多其他存在类似问题的人至少都引用了特定文件并带有NoMethod错误行，但是我没有这种东西。
有什么想法吗？
答案 0 :(得分：2)
您在rake assets:precompile期间收到此错误，因此可以在本地计算机上尝试此rake任务。
从我发现的font_url堆栈跟踪中，您可以尝试在.css文件中找到此方法并将其重命名为.scss