Ruby bundle exec padrino启动出现故障

我在执行一项任务时遇到了困难，到目前为止，这项任务在过去一年中一直没有问题。在我的机器上开发Ruby Padrino应用程序。我会用流浪汉。一旦vagrant启动，我将设置加载到putty中并执行“bundle exec padrino start-h 0.0.0”。这通常会导致环境加载，但重新启动计算机后，我现在收到以下错误：

RuntimeError: Rack config file `0.0.0.0` must have `.ru` extension
  detect_application at /home/vagrant/.rbenv/versions/jruby-1.7.18/lib/ruby/gems/shared/gems/padrino-core-0.12.4/lib/padrino-core/server.rb:23
                run! at /home/vagrant/.rbenv/versions/jruby-1.7.18/lib/ruby/gems/shared/gems/padrino-core-0.12.4/lib/padrino-core/server.rb:12
               start at /home/vagrant/.rbenv/versions/jruby-1.7.18/lib/ruby/gems/shared/gems/padrino-core-0.12.4/lib/padrino-core/cli/adapter.rb:7
               start at /home/vagrant/.rbenv/versions/jruby-1.7.18/lib/ruby/gems/shared/gems/padrino-core-0.12.4/lib/padrino-core/cli/launcher.rb:30
                 run at /home/vagrant/.rbenv/versions/jruby-1.7.18/lib/ruby/gems/shared/gems/thor-0.19.1/lib/thor/command.rb:27
      invoke_command at /home/vagrant/.rbenv/versions/jruby-1.7.18/lib/ruby/gems/shared/gems/thor-0.19.1/lib/thor/invocation.rb:126
            dispatch at /home/vagrant/.rbenv/versions/jruby-1.7.18/lib/ruby/gems/shared/gems/thor-0.19.1/lib/thor.rb:359
               start at /home/vagrant/.rbenv/versions/jruby-1.7.18/lib/ruby/gems/shared/gems/thor-0.19.1/lib/thor/base.rb:440
              (root) at /home/vagrant/.rbenv/versions/jruby-1.7.18/lib/ruby/gems/shared/gems/padrino-core-0.12.4/bin/padrino:9
                load at org/jruby/RubyKernel.java:1087
              (root) at /home/vagrant/.rbenv/versions/jruby-1.7.18/bin/padrino:23

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在此之前，我还必须运行bundle安装，所以我想知道是更新的gem文件导致了这个问题还是其他问题。请提供任何信息。

为了解决此问题，我必须将Bundler的版本从1.12.0恢复到1.11.2。我不知道发生了什么变化，但如果有人能解释一下，我将不胜感激

如果在引号中有命令，则该命令将按预期执行：

bundle exec'padrino start-h0.0.0'

Bundler中的错误已知，并在问题中报告