Ruby on rails 在任何源中都找不到线程\u safe-0.3.5

我在Ubuntu 14.04服务器上运行

cap production deploy

时遇到此错误

这似乎是一个类似的问题，但我已经尝试了这里的所有答案，但无法让它工作

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更新：我已经尝试部署到Heroku，但遇到了类似的错误。如果有人有什么建议，那就太好了

$ git push heroku master
Counting objects: 10017, done.
Delta compression using up to 4 threads.
Compressing objects: 100% (7613/7613), done.
Writing objects: 100% (10017/10017), 22.27 MiB | 87.00 KiB/s, done.
Total 10017 (delta 2426), reused 7631 (delta 1548)
remote: Compressing source files... done.
remote: Building source:
remote: 
remote: -----> Warning: Multiple default buildpacks reported the ability to handle this app. The first buildpack in the list below will be used.
remote:        Detected buildpacks: Ruby, Node.js
remote:        See https://devcenter.heroku.com/articles/buildpacks#buildpack-detect-order
remote: -----> Ruby app detected
remote: -----> Compiling Ruby/Rails
remote: -----> Using Ruby version: ruby-2.0.0
remote: -----> Installing dependencies using 1.7.12
remote:        Running: bundle install --without development:test --path vendor/bundle --binstubs vendor/bundle/bin -j4 --deployment
remote:        Some gems seem to be missing from your vendor/cache directory.
remote:        Could not find thread_safe-0.3.5 in any of the sources
remote:        Bundler Output: Some gems seem to be missing from your vendor/cache directory.
remote:        Could not find thread_safe-0.3.5 in any of the sources
remote:  !
remote:  !     Failed to install gems via Bundler.
remote:  !
remote: 
remote:  !     Push rejected, failed to compile Ruby app
remote: 
remote: Verifying deploy...
remote: 
remote: !   Push rejected to mysterious-badlands-3241.
remote: 

可能重复的

$ git push heroku master
Counting objects: 10017, done.
Delta compression using up to 4 threads.
Compressing objects: 100% (7613/7613), done.
Writing objects: 100% (10017/10017), 22.27 MiB | 87.00 KiB/s, done.
Total 10017 (delta 2426), reused 7631 (delta 1548)
remote: Compressing source files... done.
remote: Building source:
remote: 
remote: -----> Warning: Multiple default buildpacks reported the ability to handle this app. The first buildpack in the list below will be used.
remote:        Detected buildpacks: Ruby, Node.js
remote:        See https://devcenter.heroku.com/articles/buildpacks#buildpack-detect-order
remote: -----> Ruby app detected
remote: -----> Compiling Ruby/Rails
remote: -----> Using Ruby version: ruby-2.0.0
remote: -----> Installing dependencies using 1.7.12
remote:        Running: bundle install --without development:test --path vendor/bundle --binstubs vendor/bundle/bin -j4 --deployment
remote:        Some gems seem to be missing from your vendor/cache directory.
remote:        Could not find thread_safe-0.3.5 in any of the sources
remote:        Bundler Output: Some gems seem to be missing from your vendor/cache directory.
remote:        Could not find thread_safe-0.3.5 in any of the sources
remote:  !
remote:  !     Failed to install gems via Bundler.
remote:  !
remote: 
remote:  !     Push rejected, failed to compile Ruby app
remote: 
remote: Verifying deploy...
remote: 
remote: !   Push rejected to mysterious-badlands-3241.
remote: