铁轨泊坞窗应用程序捆绑耙中止

我正在尝试使用docker创buildRails应用程序，并在初始docker build过程中出现错误。 我一直在关注各种教程，试图让这个工作，但没有任何运气。

我的错误：

 Step 10/12 : RUN bundle exec rake RAILS_ENV=production DATABASE_URL=postgresql://user:pass@127.0.0.1/neo SECRET_TOKEN=foobar assets:precompile ---> Running in d3d282e3eb8b /usr/local/bundle/gems/activesupport-5.0.1/lib/active_support/xml_mini.rb:51: warning: constant ::Fixnum is deprecated /usr/local/bundle/gems/activesupport-5.0.1/lib/active_support/xml_mini.rb:52: warning: constant ::Bignum is deprecated rake aborted! NoMethodError: undefined method `split' for nil:NilClass /app/config/application.rb:57:in `<class:Application>' /app/config/application.rb:10:in `<module:NeoDocker>' /app/config/application.rb:9:in `<top (required)>' /app/Rakefile:5:in `require_relative' /app/Rakefile:5:in `<top (required)>' /usr/local/bundle/gems/rake-12.0.0/exe/rake:27:in `<top (required)>' /usr/local/bin/bundle:23:in `load' /usr/local/bin/bundle:23:in `<main>' (See full trace by running task with --trace) The command '/bin/sh -c bundle exec rake RAILS_ENV=production DATABASE_URL=postgresql://user:pass@127.0.0.1/neo SECRET_TOKEN=foobar assets:precompile' returned a non-zero code: 1 

Dockerfile：

 FROM ruby:2.4.1 RUN apt-get update && apt-get install -qq -y --no-install-recommends \ build-essential nodejs libpq-dev ENV INSTALL_PATH /app RUN mkdir -p $INSTALL_PATH WORKDIR $INSTALL_PATH COPY Gemfile Gemfile.lock ./ RUN bundle install --binstubs COPY . . RUN bundle exec rake RAILS_ENV=production DATABASE_URL=postgresql://user:pass@127.0.0.1/neo SECRET_TOKEN=foobar assets:precompile VOLUME ["$INSTALL_PATH/public"] CMD puma -C config/puma.rb 

我的Gemfile现在是Rails 5的默认版本：

 source 'https://rubygems.org' gem 'rails', '~> 5.0.1' gem 'puma', '~> 3.0' gem 'rack-timeout', '~> 0.4' gem 'jbuilder', '~> 2.5' gem 'pg', '~> 0.18' gem 'redis-rails', '~> 5.0.0.pre' gem 'sidekiq', '~> 4.2' gem 'sass-rails', '~> 5.0' gem 'uglifier', '>= 1.3.0' gem 'jquery-rails' gem 'turbolinks', '~> 5' gem 'bootstrap-sass', '~> 3.3' gem 'font-awesome-rails', '~> 4.7' group :development, :test do gem 'byebug', platform: :mri end group :development do gem 'rack-mini-profiler', '~> 0.10' gem 'web-console', '~> 3.3.0' gem 'listen', '~> 3.0.5' gem 'spring' gem 'spring-watcher-listen', '~> 2.0.0' end gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby] 

这里有什么问题？