使用cocoapods遇到的问题

MacBook-Pro:YYModelDemo apple$ pod update
Update all pods
Updating local specs repositories
  $ /usr/local/bin/git -C /Users/apple/.cocoapods/repos/master fetch origin --progress
  remote: Counting objects: 69, done.        
  remote: Compressing objects: 100% (61/61), done.        
  remote: Total 69 (delta 41), reused 0 (delta 0), pack-reused 0        
  From https://github.com/CocoaPods/Specs
     c32dc1c..1753ec6  master     -> origin/master
  $ /usr/local/bin/git -C /Users/apple/.cocoapods/repos/master rev-parse --abbrev-ref HEAD
  master
  $ /usr/local/bin/git -C /Users/apple/.cocoapods/repos/master reset --hard origin/master
  HEAD is now at 1753ec6 [Add] DKCustomView 0.0.8

CocoaPods 1.5.3 is available.
To update use: `sudo gem install cocoapods`

For more information, see https://blog.cocoapods.org and the CHANGELOG for this version at https://github.com/CocoaPods/CocoaPods/releases/tag/1.5.3

Analyzing dependencies

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### Command

```
/usr/local/bin/pod update
```

### Report

* What did you do?

* What did you expect to happen?

* What happened instead?


### Stack

```
   CocoaPods : 1.3.1
        Ruby : ruby 2.3.1p112 (2016-04-26 revision 54768) [x86_64-darwin15]
    RubyGems : 2.6.14
        Host : Mac OS X 10.13.4 (17E202)
       Xcode : 9.3 (9E145)
         Git : git version 2.7.1
Ruby lib dir : /usr/local/Cellar/ruby/2.3.1/lib
Repositories : master - https://github.com/CocoaPods/Specs.git @ 1753ec6ab254745972bf1c4ae624fc3aad67dd92
```

### 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
```

### Podfile

```ruby
platform:ios,'9.0'
target 'YYModelDemo' do
pod 'YYKit', '~> 1.0.9'

end
```

### Error

```
RuntimeError - [Xcodeproj] Unknown object version.
/usr/local/lib/ruby/gems/2.3.0/gems/xcodeproj-1.5.3/lib/xcodeproj/project.rb:217:in `initialize_from_file'
/usr/local/lib/ruby/gems/2.3.0/gems/xcodeproj-1.5.3/lib/xcodeproj/project.rb:102:in `open'
/usr/local/lib/ruby/gems/2.3.0/gems/cocoapods-1.3.1/lib/cocoapods/installer/analyzer.rb:903:in `block (2 levels) in inspect_targets_to_integrate'
/usr/local/lib/ruby/gems/2.3.0/gems/cocoapods-1.3.1/lib/cocoapods/installer/analyzer.rb:902:in `each'
/usr/local/lib/ruby/gems/2.3.0/gems/cocoapods-1.3.1/lib/cocoapods/installer/analyzer.rb:902:in `block in inspect_targets_to_integrate'
/usr/local/lib/ruby/gems/2.3.0/gems/cocoapods-1.3.1/lib/cocoapods/user_interface.rb:64:in `section'
/usr/local/lib/ruby/gems/2.3.0/gems/cocoapods-1.3.1/lib/cocoapods/installer/analyzer.rb:897:in `inspect_targets_to_integrate'
/usr/local/lib/ruby/gems/2.3.0/gems/cocoapods-1.3.1/lib/cocoapods/installer/analyzer.rb:69:in `analyze'
/usr/local/lib/ruby/gems/2.3.0/gems/cocoapods-1.3.1/lib/cocoapods/installer.rb:242:in `analyze'
/usr/local/lib/ruby/gems/2.3.0/gems/cocoapods-1.3.1/lib/cocoapods/installer.rb:154:in `block in resolve_dependencies'
/usr/local/lib/ruby/gems/2.3.0/gems/cocoapods-1.3.1/lib/cocoapods/user_interface.rb:64:in `section'
/usr/local/lib/ruby/gems/2.3.0/gems/cocoapods-1.3.1/lib/cocoapods/installer.rb:153:in `resolve_dependencies'
/usr/local/lib/ruby/gems/2.3.0/gems/cocoapods-1.3.1/lib/cocoapods/installer.rb:116:in `install!'
/usr/local/lib/ruby/gems/2.3.0/gems/cocoapods-1.3.1/lib/cocoapods/command/update.rb:81:in `run'
/usr/local/lib/ruby/gems/2.3.0/gems/claide-1.0.2/lib/claide/command.rb:334:in `run'
/usr/local/lib/ruby/gems/2.3.0/gems/cocoapods-1.3.1/lib/cocoapods/command.rb:52:in `run'
/usr/local/lib/ruby/gems/2.3.0/gems/cocoapods-1.3.1/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.

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 - RuntimeError - [Xcodeproj] Unknown object version.