当我尝试运行“rails server”或“rake jobs:work”时，我收到错误消息：“没有要加载的文件——treetop/runtime”
完整的跟踪：
macbook-pro-2:domain ryan$ rake jobs:work --trace(in /Applications/htdocs/domain) rake 中止！没有要加载的文件——treetop/runtime /opt/local/lib/ruby/gems/1.8/gems/mail-2.2.14/lib/mail.rb:68:in require'
/opt/local/lib/ruby/gems/1.8/gems/mail-2.2.14/lib/mail.rb:68
/opt/local/lib/ruby/gems/1.8/gems/mail-2.2.14/lib/mail.rb:61:ineach' /opt/local/lib/ruby /gems/1.8/gems/mail-2.2.14/lib/mail.rb:61 /opt/local/lib/ruby/gems/1.8/gems/delayed_job-2.1.2/lib/delayed/performable_mailer.rb:1 ：在require'
/opt/local/lib/ruby/gems/1.8/gems/delayed_job-2.1.2/lib/delayed/performable_mailer.rb:1
/opt/local/lib/ruby/gems/1.8/gems/delayed_job-2.1.2/lib/delayed_job.rb:5:in需要'/opt/local/lib/ruby/gems/1.8/gems/delayed_job-2.1.2/lib/delayed_job.rb:5 /opt/local/lib/ruby/gems/1.8/gems/bundler-1.0 .7/lib/bundler/runtime.rb:64:inrequire'
/opt/local/lib/ruby/gems/1.8/gems/bundler-1.0.7/lib/bundler/runtime.rb:64:in要求'/opt/local/lib/ruby/gems/1.8/gems/bundler-1.0.7/lib/bundler/runtime.rb:62:ineach'
/opt/local/lib/ruby/gems/1.8/gems/bundler-1.0.7/lib/bundler/runtime.rb:62:in要求' /opt/local/lib/ruby/gems/1.8/gems/bundler-1.0.7/lib/bundler/runtime.rb:51:ineach'
/opt/local/lib/ruby/gems/1.8/gems/bundler-1.0.7/lib/bundler/runtime.rb:51:in要求' /opt/local/lib/ruby/gems/1.8/gems/bundler -1.0.7/lib/bundler.rb:112:inrequire'
/ApApplications/htdocs/domain/config/application.rb:7
/opt/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:ingem_original_require' /opt/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in require'
/Applications/htdocs/domain/Rakefile:4
/opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2383:inload' /opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake .rb:2383:in raw_load_rakefile'
/opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2017:inload_rakefile' /opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2068:in standard_exception_handling'
/opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2016:inload_rakefile' /opt/local/lib/ruby/gems /1.8/gems/rake-0.8.7/lib/rake.rb:2000:in run'
/opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2068:instandard_exception_handling' /opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:1998 :in run'
/opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/bin/rake:31
/opt/local/bin/rake:19:inload' /opt/local/bin/rake:19
在我的 Gemfile 中，我有：“gem 'delayed_job'”