レーキが中止！ NoMethodError：未定義メソッド `[] 'for nil：NilClass（rails5 + heroku）

Question

私はアセットをローカルでコンパイルしようとしていますので、herokuにプッシュする際に問題がないことを確認できます。ローカルでは私のビューは完璧に見えますが、ヒロクではすべての資産がロードされていません。私が走るときRAILS_ENV=production bundle exec rake assets:precompile

私は以下のエラー、任意のアイデアを得る？ 3つのラインの下に

rake aborted! 
NoMethodError: undefined method `[]' for nil:NilClass 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sprockets-3.7.0/lib/sprockets/sass_processor.rb:278:in `sprockets_context' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sprockets-3.7.0/lib/sprockets/sass_processor.rb:124:in `asset_path' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sprockets-3.7.0/lib/sprockets/sass_processor.rb:137:in `asset_url' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sprockets-3.7.0/lib/sprockets/sass_processor.rb:209:in `font_url' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sass-3.4.22/lib/sass/script/tree/funcall.rb:143:in `_perform' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sass-3.4.22/lib/sass/script/tree/node.rb:58:in `perform' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sass-3.4.22/lib/sass/tree/visitors/perform.rb:397:in `visit_prop' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sass-3.4.22/lib/sass/tree/visitors/base.rb:36:in `visit' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sass-3.4.22/lib/sass/tree/visitors/perform.rb:160:in `block in visit' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sass-3.4.22/lib/sass/stack.rb:79:in `block in with_base' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sass-3.4.22/lib/sass/stack.rb:115:in `with_frame' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sass-3.4.22/lib/sass/stack.rb:79:in `with_base' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sass-3.4.22/lib/sass/tree/visitors/perform.rb:160:in `visit' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sass-3.4.22/lib/sass/tree/visitors/perform.rb:504:in `block (2 levels) in visit_directive' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sass-3.4.22/lib/sass/tree/visitors/perform.rb:504:in `map' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sass-3.4.22/lib/sass/tree/visitors/perform.rb:504:in `block in visit_directive' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sass-3.4.22/lib/sass/tree/visitors/perform.rb:181:in `with_environment' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sass-3.4.22/lib/sass/tree/visitors/perform.rb:503:in `visit_directive' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sass-3.4.22/lib/sass/tree/visitors/base.rb:36:in `visit' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sass-3.4.22/lib/sass/tree/visitors/perform.rb:160:in `block in visit' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sass-3.4.22/lib/sass/stack.rb:79:in `block in with_base' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sass-3.4.22/lib/sass/stack.rb:115:in `with_frame' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sass-3.4.22/lib/sass/stack.rb:79:in `with_base' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sass-3.4.22/lib/sass/tree/visitors/perform.rb:160:in `visit' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sass-3.4.22/lib/sass/tree/visitors/base.rb:52:in `block in visit_children' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sass-3.4.22/lib/sass/tree/visitors/base.rb:52:in `map' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sass-3.4.22/lib/sass/tree/visitors/base.rb:52:in `visit_children' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sass-3.4.22/lib/sass/tree/visitors/perform.rb:169:in `block in visit_children' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sass-3.4.22/lib/sass/tree/visitors/perform.rb:181:in `with_environment' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sass-3.4.22/lib/sass/tree/visitors/perform.rb:168:in `visit_children' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sass-3.4.22/lib/sass/tree/visitors/base.rb:36:in `block in visit' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sass-3.4.22/lib/sass/tree/visitors/perform.rb:188:in `visit_root' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sass-3.4.22/lib/sass/tree/visitors/base.rb:36:in `visit' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sass-3.4.22/lib/sass/tree/visitors/perform.rb:159:in `visit' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sass-3.4.22/lib/sass/tree/visitors/perform.rb:8:in `visit' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sass-3.4.22/lib/sass/tree/root_node.rb:36:in `css_tree' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sass-3.4.22/lib/sass/tree/root_node.rb:20:in `render' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sass-3.4.22/lib/sass/engine.rb:281:in `render' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sprockets-3.7.0/lib/sprockets/sass_compressor.rb:48:in `call' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sprockets-3.7.0/lib/sprockets/sass_compressor.rb:28:in `call' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sprockets-3.7.0/lib/sprockets/processor_utils.rb:75:in `call_processor' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sprockets-3.7.0/lib/sprockets/processor_utils.rb:57:in `block in call_processors' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sprockets-3.7.0/lib/sprockets/processor_utils.rb:56:in `reverse_each' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sprockets-3.7.0/lib/sprockets/processor_utils.rb:56:in `call_processors' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sprockets-3.7.0/lib/sprockets/loader.rb:134:in `load_from_unloaded' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sprockets-3.7.0/lib/sprockets/loader.rb:60:in `block in load' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sprockets-3.7.0/lib/sprockets/loader.rb:317:in `fetch_asset_from_dependency_cache' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sprockets-3.7.0/lib/sprockets/loader.rb:44:in `load' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sprockets-3.7.0/lib/sprockets/cached_environment.rb:20:in `block in initialize' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sprockets-3.7.0/lib/sprockets/cached_environment.rb:47:in `load' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sprockets-3.7.0/lib/sprockets/base.rb:66:in `find_asset' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sprockets-3.7.0/lib/sprockets/base.rb:73:in `find_all_linked_assets' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sprockets-3.7.0/lib/sprockets/manifest.rb:142:in `block in find' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sprockets-3.7.0/lib/sprockets/legacy.rb:114:in `block (2 levels) in logical_paths' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sprockets-3.7.0/lib/sprockets/path_utils.rb:228:in `block in stat_tree' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sprockets-3.7.0/lib/sprockets/path_utils.rb:212:in `block in stat_directory' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sprockets-3.7.0/lib/sprockets/path_utils.rb:209:in `each' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sprockets-3.7.0/lib/sprockets/path_utils.rb:209:in `stat_directory' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sprockets-3.7.0/lib/sprockets/path_utils.rb:227:in `stat_tree' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sprockets-3.7.0/lib/sprockets/legacy.rb:105:in `each' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sprockets-3.7.0/lib/sprockets/legacy.rb:105:in `block in logical_paths' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sprockets-3.7.0/lib/sprockets/legacy.rb:104:in `each' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sprockets-3.7.0/lib/sprockets/legacy.rb:104:in `logical_paths' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sprockets-3.7.0/lib/sprockets/manifest.rb:140:in `find' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sprockets-3.7.0/lib/sprockets/manifest.rb:185:in `compile' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sprockets-rails-3.1.1/lib/sprockets/rails/task.rb:68:in `block (3 levels) in define' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sprockets-3.7.0/lib/rake/sprocketstask.rb:147:in `with_logger' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sprockets-rails-3.1.1/lib/sprockets/rails/task.rb:67:in `block (2 levels) in define' 
/Users/admin/.rvm/gems/ruby-2.3.1@global/gems/rake-11.2.2/exe/rake:27:in `<top (required)>' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/bin/ruby_executable_hooks:15:in `eval' 
/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/bin/ruby_executable_hooks:15:in `<main>' 
Tasks: TOP => assets:precompile 
(See full trace by running task with --trace) 

Answer 1

gem open sprockets -v 3.7.0および追加/Users/admin/.rvm/gems/ruby-2.3.1@ryansportfolio/gems/sprockets-3.7.0/lib/sprocketsへ

puts '#'*30 
puts path 
puts '#'*30 

/sass_processor.rb:124

次に、アセット/イメージファイルがないか、またはasset-urlをCSSで使用しているため、どのファイルがエラーを引き起こしているかを知ることができます。 （アセットURLはscssでのみ利用可能）