Я совершенно новичок в ruby по рельсам и героку. Я развернул свое первое приложение ruby on rails на heroku, и когда я захожу на сайт, там написано Ошибка приложения.
Журналы Heroku:
2018-10-29T00:40:38.462970+00:00 heroku[web.1]: State changed from crashed to starting
2018-10-29T00:40:43.768770+00:00 heroku[web.1]: Starting process with command `bin/rails server -p 43245 -e production`
2018-10-29T00:40:47.367294+00:00 app[web.1]: Ignoring bootsnap-1.3.2 because its extensions are not built. Try: gem pristine bootsnap --version 1.3.2
2018-10-29T00:40:47.927710+00:00 app[web.1]: /app/vendor/bundle/ruby/2.5.0/gems/bundler-1.15.2/lib/bundler/spec_set.rb:87:in `block in materialize': Could not find nokogiri-1.8.5 in any of the sources (Bundler::GemNotFound)
2018-10-29T00:40:47.927736+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.5.0/gems/bundler-1.15.2/lib/bundler/spec_set.rb:81:in `map!'
2018-10-29T00:40:47.927740+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.5.0/gems/bundler-1.15.2/lib/bundler/spec_set.rb:81:in `materialize'
2018-10-29T00:40:47.927742+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.5.0/gems/bundler-1.15.2/lib/bundler/definition.rb:159:in `specs'
2018-10-29T00:40:47.927744+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.5.0/gems/bundler-1.15.2/lib/bundler/definition.rb:218:in `specs_for'
2018-10-29T00:40:47.927745+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.5.0/gems/bundler-1.15.2/lib/bundler/definition.rb:207:in `requested_specs'
2018-10-29T00:40:47.927748+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.5.0/gems/bundler-1.15.2/lib/bundler/runtime.rb:109:in `block in definition_method'
2018-10-29T00:40:47.927750+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.5.0/gems/bundler-1.15.2/lib/bundler/runtime.rb:21:in `setup'
2018-10-29T00:40:47.927752+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.5.0/gems/bundler-1.15.2/lib/bundler.rb:101:in `setup'
2018-10-29T00:40:47.927753+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.5.0/gems/bundler-1.15.2/lib/bundler/setup.rb:19:in `<top (required)>'
2018-10-29T00:40:47.927756+00:00 app[web.1]: from /usr/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:135:in `require'
2018-10-29T00:40:47.927758+00:00 app[web.1]: from /usr/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:135:in `rescue in require'
2018-10-29T00:40:47.927759+00:00 app[web.1]: from /usr/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:39:in `require'
2018-10-29T00:40:47.927762+00:00 app[web.1]: from /app/config/boot.rb:3:in `<top (required)>'
2018-10-29T00:40:47.927764+00:00 app[web.1]: from bin/rails:3:in `require_relative'
2018-10-29T00:40:47.927767+00:00 app[web.1]: from bin/rails:3:in `<main>'
2018-10-29T00:40:48.028594+00:00 heroku[web.1]: State changed from starting to crashed
2018-10-29T00:40:48.011732+00:00 heroku[web.1]: Process exited with status 1