执行pod init报错

笔记在执行pod init时报错如下：
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Command

/usr/local/bin/pod init

Report

• What did you do?

• What did you expect to happen?

• What happened instead?

Stack

   CocoaPods : 1.4.0.beta.1
        Ruby : ruby 2.3.3p222 (2016-11-21 revision 56859) [universal.x86_64-darwin17]
    RubyGems : 2.6.13
        Host : Mac OS X 10.13.4 (17E202)
       Xcode : 9.4 (9F1027a)
         Git : git version 2.15.1 (Apple Git-101)
Ruby lib dir : /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib
Repositories : master - https://github.com/CocoaPods/Specs.git @ 9b3a30eaf895fced56099a774ddba9978685ef72

Plugins

cocoapods-deintegrate : 1.0.1
cocoapods-plugins     : 1.0.0
cocoapods-search      : 1.0.0
cocoapods-stats       : 1.0.0
cocoapods-trunk       : 1.3.0
cocoapods-try         : 1.1.0

Error

RuntimeError - [Xcodeproj] Unknown object version.
/Library/Ruby/Gems/2.3.0/gems/xcodeproj-1.5.2/lib/xcodeproj/project.rb:217:in `initialize_from_file'
/Library/Ruby/Gems/2.3.0/gems/xcodeproj-1.5.2/lib/xcodeproj/project.rb:102:in `open'
/Library/Ruby/Gems/2.3.0/gems/cocoapods-1.4.0.beta.1/lib/cocoapods/command/init.rb:41:in `validate!'
/Library/Ruby/Gems/2.3.0/gems/claide-1.0.2/lib/claide/command.rb:333:in `run'
/Library/Ruby/Gems/2.3.0/gems/cocoapods-1.4.0.beta.1/lib/cocoapods/command.rb:52:in `run'
/Library/Ruby/Gems/2.3.0/gems/cocoapods-1.4.0.beta.1/bin/pod:55:in `<top (required)>'
/usr/local/bin/pod:23:in `load'
/usr/local/bin/pod:23:in `<main>'

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[!] Oh no, an error occurred.

Search for existing GitHub issues similar to yours:
https://github.com/CocoaPods/CocoaPods/search?q=%5BXcodeproj%5D+Unknown+object+version.&type=Issues

If none exists, create a ticket, with the template displayed above, on:
https://github.com/CocoaPods/CocoaPods/issues/new

Be sure to first read the contributing guide for details on how to properly submit a ticket:
https://github.com/CocoaPods/CocoaPods/blob/master/CONTRIBUTING.md

Don't forget to anonymize any private data!

Looking for related issues on cocoapods/cocoapods...

• RuntimeError - [Xcodeproj] Unknown object version.
  https://github.com/CocoaPods/CocoaPods/issues/7697 [closed] [19 comments]
  2 days ago

• Unknown object version
  https://github.com/CocoaPods/CocoaPods/issues/7760 [closed] [1 comment]
  3 weeks ago

• RuntimeError - [Xcodeproj] Unknown object version. 🌈
  https://github.com/CocoaPods/CocoaPods/issues/7712 [closed] [9 comments]
  4 weeks ago

and 38 more at:
https://github.com/cocoapods/cocoapods/search?q=[Xcodeproj]%20Unknown%20object%20version.&type=Issues&utf8=✓

看这一堆输出，着实让我懵逼了一早上，那么是什么问题导致该问题的产生？又改如何解决？

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解决方法如下

Snip20180609_1.png
把Project Format修改成Xcode 8.0-compatible即可。

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其他问题

• 执行pod install报错如何解决，参考该文章