Pod 集成时报错

错误描述：

### Report

* What did you do?

* What did you expect to happen?

* What happened instead?

### Stack

   CocoaPods : 1.2.0

        Ruby : ruby 2.0.0p643 (2015-02-25 revision 49749) [x86_64-darwin14.5.0]

    RubyGems : 2.6.6

        Host : Mac OS X 10.13.4 (17E199)

       Xcode : 9.3 (9E145)

         Git : git version 2.15.1 (Apple Git-101)

Ruby lib dir : /Users/qqqq/.rvm/rubies/ruby-2.0.0-p643/lib

Repositories : master - https://github.com/CocoaPods/Specs.git @ d0a0ba10caedbe7cc887411b987a5d458c8e9209


### Plugins

cocoapods-deintegrate : 1.0.1

cocoapods-plugins    : 1.0.0

cocoapods-search      : 1.0.0

cocoapods-stats      : 1.0.0

cocoapods-trunk      : 1.1.2

cocoapods-try        : 1.1.0



### Podfile
ruby

platform :ios, '8.0'

use_frameworks!

target 'SilverMeter' do

end



### Error



RuntimeError - [Xcodeproj] Unknown object version.

/Users/qqqq/.rvm/gems/ruby-2.0.0-p643@global/gems/xcodeproj-1.4.2/lib/xcodeproj/project.rb:217:in `initialize_from_file'

/Users/qqqq/.rvm/gems/ruby-2.0.0-p643@global/gems/xcodeproj-1.4.2/lib/xcodeproj/project.rb:102:in `open'

/Users/qqqq/.rvm/gems/ruby-2.0.0-p643@global/gems/cocoapods-1.2.0/lib/cocoapods/installer/analyzer.rb:851:in `block (2 levels) in inspect_targets_to_integrate'

/Users/qqqq/.rvm/gems/ruby-2.0.0-p643@global/gems/cocoapods-1.2.0/lib/cocoapods/installer/analyzer.rb:850:in `each'

/Users/qqqq/.rvm/gems/ruby-2.0.0-p643@global/gems/cocoapods-1.2.0/lib/cocoapods/installer/analyzer.rb:850:in `block in inspect_targets_to_integrate'

/Users/qqqq/.rvm/gems/ruby-2.0.0-p643@global/gems/cocoapods-1.2.0/lib/cocoapods/user_interface.rb:64:in `section'

/Users/qqqq/.rvm/gems/ruby-2.0.0-p643@global/gems/cocoapods-1.2.0/lib/cocoapods/installer/analyzer.rb:845:in `inspect_targets_to_integrate'

/Users/qqqq/.rvm/gems/ruby-2.0.0-p643@global/gems/cocoapods-1.2.0/lib/cocoapods/installer/analyzer.rb:66:in `analyze'

/Users/qqqq/.rvm/gems/ruby-2.0.0-p643@global/gems/cocoapods-1.2.0/lib/cocoapods/installer.rb:236:in `analyze'

/Users/qqqq/.rvm/gems/ruby-2.0.0-p643@global/gems/cocoapods-1.2.0/lib/cocoapods/installer.rb:150:in `block in resolve_dependencies'

/Users/qqqq/.rvm/gems/ruby-2.0.0-p643@global/gems/cocoapods-1.2.0/lib/cocoapods/user_interface.rb:64:in `section'

/Users/qqqq/.rvm/gems/ruby-2.0.0-p643@global/gems/cocoapods-1.2.0/lib/cocoapods/installer.rb:149:in `resolve_dependencies'

/Users/qqqq/.rvm/gems/ruby-2.0.0-p643@global/gems/cocoapods-1.2.0/lib/cocoapods/installer.rb:110:in `install!'

/Users/qqqq/.rvm/gems/ruby-2.0.0-p643@global/gems/cocoapods-1.2.0/lib/cocoapods/command/install.rb:37:in `run'

/Users/qqqq/.rvm/gems/ruby-2.0.0-p643@global/gems/claide-1.0.1/lib/claide/command.rb:334:in `run'

/Users/qqqq/.rvm/gems/ruby-2.0.0-p643@global/gems/cocoapods-1.2.0/lib/cocoapods/command.rb:52:in `run'

/Users/qqqq/.rvm/gems/ruby-2.0.0-p643@global/gems/cocoapods-1.2.0/bin/pod:55:in `'

/Users/qqqq/.rvm/rubies/ruby-2.0.0-p643/bin/pod:23:in `load'

/Users/qqqq/.rvm/rubies/ruby-2.0.0-p643/bin/pod:23:in `'



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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:

解决办法：
执行： sudo gem install cocoapods
问题得到解决！！！