我对一般的开发非常陌生，并且正在关注Michael Hartl的轨道书。我的“玩具应用程序”在我的本地服务器上运行完美，但出于某种原因，当我尝试通过Heroku部署它时，我得到一个错误代码H10，描述是“app crashed”。
我不知道该怎么做才能解决这个问题，并在各个论坛上咨询了许多类似的问题，但没有一个答案似乎对我有用。当我最初尝试部署时，我收到了“推送拒绝”消息，但在运行捆绑更新后，一切似乎都完美无缺，除了我无法通过heroku查看应用程序。
对于如何解决这个问题，有任何的建议吗？
Here's the full build-log from the deployment:
-----> Ruby app detected
-----> Compiling Ruby/Rails
-----> Using Ruby version: ruby-2.3.4
-----> 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 (1.16.1). 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/.
Using rake 12.3.0
Using concurrent-ruby 1.0.5
Using minitest 5.10.3
Using thread_safe 0.3.6
Using builder 3.2.3
Using erubi 1.7.0
Using mini_portile2 2.3.0
Using crass 1.0.3
Using rack 2.0.3
Using nio4r 2.2.0
Using websocket-extensions 0.1.3
Using mini_mime 1.0.0
Using arel 8.0.0
Using bundler 1.15.2
Using coffee-script-source 1.12.2
Using execjs 2.7.0
Using method_source 0.9.0
Using thor 0.20.0
Using ffi 1.9.18
Using multi_json 1.12.2
Using pg 0.21.0
Using puma 3.11.0
Using rb-fsevent 0.10.2
Using tilt 2.0.8
Using turbolinks-source 5.0.3
Using i18n 0.9.1
Using tzinfo 1.2.4
Using nokogiri 1.8.1
Using websocket-driver 0.6.5
Using mail 2.7.0
Using coffee-script 2.4.1
Using uglifier 4.1.2
Using rb-inotify 0.9.10
Using turbolinks 5.0.1
Using activesupport 5.1.4
Using loofah 2.1.1
Using rack-test 0.8.2
Using sprockets 3.7.1
Using sass-listen 4.0.0
Using rails-html-sanitizer 1.0.3
Using sass 3.5.4
Using rails-dom-testing 2.0.3
Using globalid 0.4.1
Using activemodel 5.1.4
Using jbuilder 2.7.0
Using actionview 5.1.4
Using activejob 5.1.4
Using activerecord 5.1.4
Using actionpack 5.1.4
Using actioncable 5.1.4
Using actionmailer 5.1.4
Using railties 5.1.4
Using sprockets-rails 3.2.1
Using coffee-rails 4.2.2
Using jquery-rails 4.3.1
Using rails 5.1.4
Using sass-rails 5.0.7
Bundle complete! 18 Gemfile dependencies, 57 gems now installed.
Gems in the groups development and test were not installed.
Bundled gems are installed into ./vendor/bundle.
Bundle completed (2.73s)
Cleaning up the bundler cache.
Warning: the running version of Bundler (1.15.2) is older than the version that created the lockfile (1.16.1). We suggest you upgrade to the latest version of Bundler by running `gem install bundler`.
The latest bundler is 1.16.1, but you are currently running 1.15.2.
To update, run `gem install bundler`
-----> Installing node-v6.11.1-linux-x64
-----> Detecting rake tasks
-----> Preparing app for Rails asset pipeline
Running: rake assets:precompile
Yarn executable was not detected in the system.
Download Yarn at https://yarnpkg.com/en/docs/install
Asset precompilation completed (1.54s)
Cleaning assets
Running: rake assets:clean
###### WARNING:
You have not declared a Ruby version in your Gemfile.
To set your Ruby version add this line to your Gemfile:
ruby '2.3.4'
# See https://devcenter.heroku.com/articles/ruby-versions for more information.
###### WARNING:
No Procfile detected, using the default web server.
We recommend explicitly declaring how to boot your server process via a Procfile.
https://devcenter.heroku.com/articles/ruby-default-web-server
-----> Discovering process types
Procfile declares types -> (none)
Default types for buildpack -> console, rake, web, worker
-----> Compressing...
Done: 37.3M
-----> Launching...
Released v11
https://still-everglades-21863.herokuapp.com/ deployed to Heroku
SQLite将数据存储在文件中。 Heroku不允许存储用户的文件，因此您不能将SQLite与Heroku一起使用。相反，你应该切换到另一个数据库，如PostgreSQL或MySQL。 Here你可以找到细节。