### Error
RuntimeError - [Xcodeproj] Unknown object version.
/Users/ios/.rvm/gems/ruby-2.7.0/gems/xcodeproj-1.19.0/lib/xcodeproj/project.rb:227:in `initialize_from_file'
/Users/ios/.rvm/gems/ruby-2.7.0/gems/xcodeproj-1.19.0/lib/xcodeproj/project.rb:112:in `open'
/Users/ios/.rvm/rubies/ruby-2.7.0/lib/ruby/gems/2.7.0/gems/cocoapods-1.10.1/lib/cocoapods/installer/analyzer.rb:1186:in `block (2 levels) in inspect_targets_to_integrate'
/Users/ios/.rvm/rubies/ruby-2.7.0/lib/ruby/gems/2.7.0/gems/cocoapods-1.10.1/lib/cocoapods/installer/analyzer.rb:1185:in `each'
/Users/ios/.rvm/rubies/ruby-2.7.0/lib/ruby/gems/2.7.0/gems/cocoapods-1.10.1/lib/cocoapods/installer/analyzer.rb:1185:in `block in inspect_targets_to_integrate'
/Users/ios/.rvm/rubies/ruby-2.7.0/lib/ruby/gems/2.7.0/gems/cocoapods-1.10.1/lib/cocoapods/user_interface.rb:64:in `section'
/Users/ios/.rvm/rubies/ruby-2.7.0/lib/ruby/gems/2.7.0/gems/cocoapods-1.10.1/lib/cocoapods/installer/analyzer.rb:1180:in `inspect_targets_to_integrate'
/Users/ios/.rvm/rubies/ruby-2.7.0/lib/ruby/gems/2.7.0/gems/cocoapods-1.10.1/lib/cocoapods/installer/analyzer.rb:106:in `analyze'
/Users/ios/.rvm/rubies/ruby-2.7.0/lib/ruby/gems/2.7.0/gems/cocoapods-1.10.1/lib/cocoapods/installer.rb:414:in `analyze'
/Users/ios/.rvm/rubies/ruby-2.7.0/lib/ruby/gems/2.7.0/gems/cocoapods-1.10.1/lib/cocoapods/installer.rb:239:in `block in resolve_dependencies'
/Users/ios/.rvm/rubies/ruby-2.7.0/lib/ruby/gems/2.7.0/gems/cocoapods-1.10.1/lib/cocoapods/user_interface.rb:64:in `section'
/Users/ios/.rvm/rubies/ruby-2.7.0/lib/ruby/gems/2.7.0/gems/cocoapods-1.10.1/lib/cocoapods/installer.rb:238:in `resolve_dependencies'
/Users/ios/.rvm/rubies/ruby-2.7.0/lib/ruby/gems/2.7.0/gems/cocoapods-1.10.1/lib/cocoapods/installer.rb:160:in `install!'
/Users/ios/.rvm/rubies/ruby-2.7.0/lib/ruby/gems/2.7.0/gems/cocoapods-1.10.1/lib/cocoapods/command/install.rb:52:in `run'
/Users/ios/.rvm/gems/ruby-2.7.0/gems/claide-1.0.3/lib/claide/command.rb:334:in `run'
/Users/ios/.rvm/rubies/ruby-2.7.0/lib/ruby/gems/2.7.0/gems/cocoapods-1.10.1/lib/cocoapods/command.rb:52:in `run'
/Users/ios/.rvm/rubies/ruby-2.7.0/lib/ruby/gems/2.7.0/gems/cocoapods-1.10.1/bin/pod:55:in `<top (required)>'
/Users/ios/.rvm/gems/ruby-2.7.0/bin/pod:23:in `load'
/Users/ios/.rvm/gems/ruby-2.7.0/bin/pod:23:in `<main>'

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[!] Oh no, an error occurred.

##原因：
是由于Xcode和cocoapods的版本不一致導(dǎo)致的
##解決辦法：
終端輸入：sudo gem install -n /usr/local/bin cocoapods --pre