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！！！
