[!] Oh no, an error occurred.

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 https://github.com/CocoaPods/CocoaPods/search?q=%5BXcodeproj%5D+Unknown+object+version.&type=Issues

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 Looking for related issues on cocoapods/cocoapods...

  - RuntimeError - [Xcodeproj] Unknown object version.

    https://github.com/CocoaPods/CocoaPods/issues/7458 [closed] [12 comments]

     days ago

  - RuntimeError - [Xcodeproj] Unknown object version.

    https://github.com/CocoaPods/CocoaPods/issues/6992 [closed] [11 comments]

    a week ago

  - RuntimeError - [Xcodeproj] Unknown object version.

    https://github.com/CocoaPods/CocoaPods/issues/6991 [closed] [11 comments]

     Feb 

 and  more at:

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

 HarelydeMacBook-Pro:testOne HuangGang$ gem install cocoapods --pre

 ERROR:  While executing gem ... (Errno::EACCES)

     Permission denied @ rb_sysopen - /Library/Ruby/Gems/2.3./gems/xcodeproj-1.5./LICENSE