Flutterfire Configure 未处理的异常和没有 firebase 初始化

我正在try 用官方文档上显示的新方法在MacOS上配置Firebase，如下所示:

firebase login
dart pub global activate flutterfire_cli
flutter fire configure

它会生成下面的错误.我寻找了这个问题，但没有找到任何解决方案.你能帮忙吗？

请注意，Flutter doctor 在任何类别中都没有显示错误，相同的项目正在使用google.infoplist文件正确地在Android上工作.我只在MacOS上使用新的初始化方法时遇到了这个问题.\

错误:

username@192 MyApp % flutterfire configure
i Found 3 Firebase projects. Selecting project [Myappname]                                                                                                           
✔ Which platforms should your configuration support (use arrow keys & space to select)? · android, ios                                                                 
i Firebase android app [app-package] registered.                                                                                                                          
i Firebase ios app [app-package] registered.                                                                                                                              
Unhandled exception:
Exception: /Library/Ruby/Site/2.6.0/rubygems/core_ext/kernel_require.rb:88:in `require': cannot load such file -- xcodeproj (LoadError)
        from /Library/Ruby/Site/2.6.0/rubygems/core_ext/kernel_require.rb:88:in `require'
        from -e:1:in `<main>'

#0      ConfigCommand.run (package:flutterfire_cli/src/commands/config.dart:540:11)
<asynchronous suspension>
#1      CommandRunner.runCommand (package:args/command_runner.dart:212:13)
<asynchronous suspension>
#2      main (file:///Users/username/.pub-cache/hosted/pub.dev/flutterfire_cli-0.2.7/bin/flutterfire.dart:57:5)
<asynchronous suspension>