我有一个使用Ruby1.8.7的Rails应用程序,在Debug模式下运行并设置断点时出现此错误:54749:ExceptioninDebugThreadloop:undefinedmethod`errmsg'for#Backtrace:/Users/ohad/.rvm/gems/ruby-1.8.7-p371/gems/ruby-debug-0.10.4/cli/ruby-debug/command.rb:188:in`errmsg'from:/Users/ohad/.rvm/gems/ruby-1.8.7-p371/gems/ruby-debug-0.10.4/cli/ruby-d