当我第一次尝试将我的应用程序推送到Heroku（雪松）时，我收到此错误：
Installing rbx-require-relative (0.0.5) Unfortunately, a fatal error has occurred. Please report this error to the Bundler issue tracker at https://github.com/carlhuda/bundler/issues so that we can fix it. Thanks!
/usr/local/lib/ruby/1.9.1/rubygems/installer.rb:164:in `install': rbx-require-relative requires Ruby version ~> 1.8.7. (Gem::InstallError)
from /tmp/build_pt5s8mtju3yr/vendor/bundle/ruby/1.9.1/gems/bundler-1.1.rc.7/lib/bundler/source.rb:90:in `block in install'
from /tmp/build_pt5s8mtju3yr/vendor/bundle/ruby/1.9.1/gems/bundler-1.1.rc.7/lib/bundler/rubygems_integration.rb:82:in `preserve_paths'
from /tmp/build_pt5s8mtju3yr/vendor/bundle/ruby/1.9.1/gems/bundler-1.1.rc.7/lib/bundler/source.rb:89:in `install'
from /tmp/build_pt5s8mtju3yr/vendor/bundle/ruby/1.9.1/gems/bundler-1.1.rc.7/lib/bundler/installer.rb:73:in `block in install_gem_from_spec'
from /tmp/build_pt5s8mtju3yr/vendor/bundle/ruby/1.9.1/gems/bundler-1.1.rc.7/lib/bundler/rubygems_integration.rb:97:in `with_build_args'
from /tmp/build_pt5s8mtju3yr/vendor/bundle/ruby/1.9.1/gems/bundler-1.1.rc.7/lib/bundler/installer.rb:72:in `install_gem_from_spec'
from /tmp/build_pt5s8mtju3yr/vendor/bundle/ruby/1.9.1/gems/bundler-1.1.rc.7/lib/bundler/installer.rb:56:in `block in run'
from /tmp/build_pt5s8mtju3yr/vendor/bundle/ruby/1.9.1/gems/bundler-1.1.rc.7/lib/bundler/installer.rb:55:in `run'
from /tmp/build_pt5s8mtju3yr/vendor/bundle/ruby/1.9.1/gems/bundler-1.1.rc.7/lib/bundler/installer.rb:12:in `install'
from /tmp/build_pt5s8mtju3yr/vendor/bundle/ruby/1.9.1/gems/bundler-1.1.rc.7/lib/bundler/cli.rb:220:in `install'
from /tmp/build_pt5s8mtju3yr/vendor/bundle/ruby/1.9.1/gems/bundler-1.1.rc.7/lib/bundler/vendor/thor/task.rb:22:in `run'
from /tmp/build_pt5s8mtju3yr/vendor/bundle/ruby/1.9.1/gems/bundler-1.1.rc.7/lib/bundler/vendor/thor/invocation.rb:118:in `invoke_task'
from /tmp/build_pt5s8mtju3yr/vendor/bundle/ruby/1.9.1/gems/bundler-1.1.rc.7/lib/bundler/vendor/thor.rb:263:in `dispatch'
from /tmp/build_pt5s8mtju3yr/vendor/bundle/ruby/1.9.1/gems/bundler-1.1.rc.7/lib/bundler/vendor/thor/base.rb:386:in `start'
from /tmp/build_pt5s8mtju3yr/vendor/bundle/ruby/1.9.1/gems/bundler-1.1.rc.7/bin/bundle:13:in `<top (required)>'
from vendor/bundle/ruby/1.9.1/bin/bundle:19:in `load'
from vendor/bundle/ruby/1.9.1/bin/bundle:19:in `<main>'
我似乎有人提到这与ruby-debug有关。但我已从我的应用中删除了ruby-debug和ruby-debug19。我的Gemfile或Gemfile.lock或我的代码中的任何其他地方都没有引用这些内容。
Bundler在本地工作正常。具体的生产方式是：
group :production do
gem 'pg'
end
这个问题可能与another question有关，我有优秀。