捆绑包更新（部署应用程序）后，我在底部遇到了这个问题，我在部署服务器上使用 rbenv 和 CentOS。
我还有其他项目运行白化问题。
我尝试运行"捆绑执行"和"捆绑执行轨道s"和"捆绑执行美洲狮"，但问题仍然存在。
更新 1："捆绑安装 --binstubs"运行良好，但未解决问题。
更新 2："在您部署的环境中，删除 Gemfile.lock 文件并进行捆绑安装以修复您的安装"不起作用。
Uptade 3：子问题：Rails：rubygems/dependency.rb：318：in 'to_specs'：找不到'activesupport'
更新4："您可以尝试更新您的应用程序用于解决此问题的活动支持版本。
更新5：将项目回滚到旧的git哈希后，问题没有发生，但最终仍然提交问题。
Looks like your app's ./bin/rails is a stub that was generated by Bundler.
In Rails 4, your app's bin/ directory contains executables that are versioned
like any other source code, rather than stubs that are generated on demand.
Here's how to upgrade:
bundle config --delete bin # Turn off Bundler's stub generator
rake rails:update:bin # Use the new Rails 4 executables
git add bin # Add bin/ to source control
You may need to remove bin/ from your .gitignore as well.
When you install a gem whose executable you want to use in your app,
generate it and add it to source control:
bundle binstubs some-gem-name
git add bin/new-executable
WARN: Unresolved specs during Gem::Specification.reset:
json (>= 1.7.7, ~> 1.7)
minitest (~> 5.1)
rack (>= 1.0, ~> 1.6)
loofah (~> 2.0)
rails-dom-testing (>= 1.0.5, ~> 1.0)
thor (< 2.0, >= 0.18.1)
WARN: Clearing out unresolved specs.
Please report a bug if this causes problems.
/home/rails/.rbenv/versions/2.2.1/lib/ruby/gems/2.2.0/gems/bundler-1.11.2/lib/bundler/runtime.rb:34:in `block in setup': You have already activated activesupport 4.2.1, but your Gemfile requires activesupport 4.2.0. Prepending `bundle exec` to your command may solve this. (Gem::LoadError)
from /home/rails/.rbenv/versions/2.2.1/lib/ruby/gems/2.2.0/gems/bundler-1.11.2/lib/bundler/runtime.rb:19:in `setup'
from /home/rails/.rbenv/versions/2.2.1/lib/ruby/gems/2.2.0/gems/bundler-1.11.2/lib/bundler.rb:92:in `setup'
from /home/rails/.rbenv/versions/2.2.1/lib/ruby/gems/2.2.0/gems/bundler-1.11.2/lib/bundler/setup.rb:8:in `<top (required)>'
from /home/rails/.rbenv/versions/2.2.1/lib/ruby/site_ruby/2.2.0/rubygems/core_ext/kernel_require.rb:126:in `require'
from /home/rails/.rbenv/versions/2.2.1/lib/ruby/site_ruby/2.2.0/rubygems/core_ext/kernel_require.rb:126:in `rescue in require'
from /home/rails/.rbenv/versions/2.2.1/lib/ruby/site_ruby/2.2.0/rubygems/core_ext/kernel_require.rb:39:in `require'
from /var/www/html/zadmin/config/boot.rb:3:in `<top (required)>'
from /home/rails/.rbenv/versions/2.2.1/lib/ruby/site_ruby/2.2.0/rubygems/core_ext/kernel_require.rb:119:in `require'
from /home/rails/.rbenv/versions/2.2.1/lib/ruby/site_ruby/2.2.0/rubygems/core_ext/kernel_require.rb:119:in `require'
from /home/rails/.rbenv/versions/2.2.1/lib/ruby/gems/2.2.0/gems/railties-4.2.1/lib/rails/app_rails_loader.rb:44:in `block in exec_app_rails'
from /home/rails/.rbenv/versions/2.2.1/lib/ruby/gems/2.2.0/gems/railties-4.2.1/lib/rails/app_rails_loader.rb:34:in `loop'
from /home/rails/.rbenv/versions/2.2.1/lib/ruby/gems/2.2.0/gems/railties-4.2.1/lib/rails/app_rails_loader.rb:34:in `exec_app_rails'
from /home/rails/.rbenv/versions/2.2.1/lib/ruby/gems/2.2.0/gems/railties-4.2.1/lib/rails/cli.rb:5:in `<top (required)>'
from /home/rails/.rbenv/versions/2.2.1/lib/ruby/site_ruby/2.2.0/rubygems/core_ext/kernel_require.rb:67:in `require'
from /home/rails/.rbenv/versions/2.2.1/lib/ruby/site_ruby/2.2.0/rubygems/core_ext/kernel_require.rb:67:in `require'
from /home/rails/.rbenv/versions/2.2.1/lib/ruby/gems/2.2.0/gems/railties-4.2.1/bin/rails:9:in `<top (required)>'
from /home/rails/.rbenv/versions/2.2.1/bin/rails:23:in `load'
from /home/rails/.rbenv/versions/2.2.1/bin/rails:23:in `<main>'
谢谢！
您可以尝试更新应用程序用于解决此问题的activesupport版本。
听起来您的系统已activesupport v4.2.1，而您的Gemfile.lock指定了v4.2.0。若要更新Gemfile.lock指定的activesupport版本，请尝试运行以下命令：
bundle update activesupport
此外，您可以尝试通过 gem uninstall activesupport 删除系统activesupport gem，然后通过 bundle install 重新安装它。