我刚刚通过rvm upgrade命令和gemset从ruby 1.9.3-p194升级到1.9.3-p286。现在，当我在我的rails应用程序上运行rake rails升级时，它给了我以下跟踪：
nosh@nosh-VirtualBox:~/Projects/icon$ rake rails update --trace
rake aborted!
cannot load such file -- ruby_debug.so
/home/nosh/.rvm/gems/ruby-1.9.3-p286/gems/ruby-debug-base19-0.11.26/lib/ruby-debug-base.rb:1:in `require'
/home/nosh/.rvm/gems/ruby-1.9.3-p286/gems/ruby-debug-base19-0.11.26/lib/ruby-debug-base.rb:1:in `<top (required)>'
/home/nosh/.rvm/gems/ruby-1.9.3-p286/gems/ruby-debug19-0.11.6/cli/ruby-debug.rb:5:in `require'
/home/nosh/.rvm/gems/ruby-1.9.3-p286/gems/ruby-debug19-0.11.6/cli/ruby-debug.rb:5:in `<top (required)>'
/home/nosh/.rvm/gems/ruby-1.9.3-p286/gems/bundler-1.2.1/lib/bundler/runtime.rb:68:in `require'
/home/nosh/.rvm/gems/ruby-1.9.3-p286/gems/bundler-1.2.1/lib/bundler/runtime.rb:68:in `block (2 levels) in require'
/home/nosh/.rvm/gems/ruby-1.9.3-p286/gems/bundler-1.2.1/lib/bundler/runtime.rb:66:in `each'
/home/nosh/.rvm/gems/ruby-1.9.3-p286/gems/bundler-1.2.1/lib/bundler/runtime.rb:66:in `block in require'
/home/nosh/.rvm/gems/ruby-1.9.3-p286/gems/bundler-1.2.1/lib/bundler/runtime.rb:55:in `each'
/home/nosh/.rvm/gems/ruby-1.9.3-p286/gems/bundler-1.2.1/lib/bundler/runtime.rb:55:in `require'
/home/nosh/.rvm/gems/ruby-1.9.3-p286/gems/bundler-1.2.1/lib/bundler.rb:128:in `require'
/home/nosh/Projects/icon/config/application.rb:7:in `<top (required)>'
/home/nosh/Projects/icon/Rakefile:5:in `require'
/home/nosh/Projects/icon/Rakefile:5:in `<top (required)>'
/home/nosh/.rvm/gems/ruby-1.9.3-p286@global/gems/rake-0.9.2.2/lib/rake/rake_module.rb:25:in `load'
/home/nosh/.rvm/gems/ruby-1.9.3-p286@global/gems/rake-0.9.2.2/lib/rake/rake_module.rb:25:in `load_rakefile'
/home/nosh/.rvm/gems/ruby-1.9.3-p286@global/gems/rake-0.9.2.2/lib/rake/application.rb:501:in `raw_load_rakefile'
/home/nosh/.rvm/gems/ruby-1.9.3-p286@global/gems/rake-0.9.2.2/lib/rake/application.rb:82:in `block in load_rakefile'
/home/nosh/.rvm/gems/ruby-1.9.3-p286@global/gems/rake-0.9.2.2/lib/rake/application.rb:133:in `standard_exception_handling'
/home/nosh/.rvm/gems/ruby-1.9.3-p286@global/gems/rake-0.9.2.2/lib/rake/application.rb:81:in `load_rakefile'
/home/nosh/.rvm/gems/ruby-1.9.3-p286@global/gems/rake-0.9.2.2/lib/rake/application.rb:65:in `block in run'
/home/nosh/.rvm/gems/ruby-1.9.3-p286@global/gems/rake-0.9.2.2/lib/rake/application.rb:133:in `standard_exception_handling'
/home/nosh/.rvm/gems/ruby-1.9.3-p286@global/gems/rake-0.9.2.2/lib/rake/application.rb:63:in `run'
/home/nosh/.rvm/gems/ruby-1.9.3-p286@global/gems/rake-0.9.2.2/bin/rake:33:in `<top (required)>'
/home/nosh/.rvm/gems/ruby-1.9.3-p286@global/bin/rake:19:in `load'
/home/nosh/.rvm/gems/ruby-1.9.3-p286@global/bin/rake:19:in `<main>'
/home/nosh/.rvm/gems/ruby-1.9.3-p286/bin/ruby_noexec_wrapper:14:in `eval'
/home/nosh/.rvm/gems/ruby-1.9.3-p286/bin/ruby_noexec_wrapper:14:in `<main>'
任何建议都表示赞赏。如果它的ruby版本与ruby debug 19 gem冲突。然后我应该如何降级回1.9.3-p194。
答案 0 :(得分：0)
我想我只是想尝试一下;但允许升级的相同rvm命令也允许降级。因此，以下命令允许我降级到以前的版本：
rvm upgrade 1.9.3-p286 1.9.3-p194
它也迁移了宝石。 顺便说一句，我还在降级后发现rake rails update命令我使用的语法不正确。 所以这是不正确的：
rake rails update --trace (incorrect)
这是正确的：
rake rails:update --trace (correct)
我再次升级后没有收到错误，这意味着我可能使用了错误的语法。