RuntimeError – [Xcodeproj] Unknown object version.

After xcode13 is upgraded, if a new project is built, pod install will report an error, as shown in the figure:

Reason: This is because the local version of Xcode does not match the version of cocoapods. You need to update cocoapods

Refer to the solution provided on the Internet and input the command at the terminal  $ gem install cocoapods --pre  

Error will be reported:     You don’t have write permissions for the /Library/Ruby/Gems/2.6.0 directory.

  Solution: input in the terminal     sudo gem install -n /usr/local/bin cocoapods –pre

It can be used normally in pod install


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