RuntimeError - [Xcodeproj] Unknown object version

[LXXuanCai]

Stack

   CocoaPods : 1.10.1
        Ruby : ruby 2.6.8p205 (2021-07-07 revision 67951) [universal.x86_64-darwin21]
    RubyGems : 3.2.19
        Host : macOS 12.0.1 (21A559)
       Xcode : 13.1 (13A1030d)
         Git : git version 2.30.1 (Apple Git-130)
Ruby lib dir : /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib
Repositories : cocoapods - git - https://github.com/CocoaPods/Specs.git @ a9d29dc409126c8a1d8302a67d3c10d3c950830d

               trunk - CDN - https://cdn.cocoapods.org/

Plugins

cocoapods-deintegrate : 1.0.4
cocoapods-plugins     : 1.0.0
cocoapods-search      : 1.0.0
cocoapods-trunk       : 1.5.0
cocoapods-try         : 1.2.0

Podfile

source 'https://github.com/CocoaPods/Specs.git'
use_frameworks!
platform :ios, '9.0'

inhibit_all_warnings!

target 'xxxxxxxx' do

pod 'MJRefresh'
    
  
end

Error

RuntimeError - [Xcodeproj] Unknown object version.
/Library/Ruby/Gems/2.6.0/gems/xcodeproj-1.19.0/lib/xcodeproj/project.rb:227:in `initialize_from_file'
/Library/Ruby/Gems/2.6.0/gems/xcodeproj-1.19.0/lib/xcodeproj/project.rb:112:in `open'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.10.1/lib/cocoapods/installer/analyzer.rb:1186:in `block (2 levels) in inspect_targets_to_integrate'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.10.1/lib/cocoapods/installer/analyzer.rb:1185:in `each'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.10.1/lib/cocoapods/installer/analyzer.rb:1185:in `block in inspect_targets_to_integrate'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.10.1/lib/cocoapods/user_interface.rb:64:in `section'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.10.1/lib/cocoapods/installer/analyzer.rb:1180:in `inspect_targets_to_integrate'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.10.1/lib/cocoapods/installer/analyzer.rb:106:in `analyze'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.10.1/lib/cocoapods/installer.rb:414:in `analyze'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.10.1/lib/cocoapods/installer.rb:239:in `block in resolve_dependencies'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.10.1/lib/cocoapods/user_interface.rb:64:in `section'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.10.1/lib/cocoapods/installer.rb:238:in `resolve_dependencies'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.10.1/lib/cocoapods/installer.rb:160:in `install!'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.10.1/lib/cocoapods/command/install.rb:52:in `run'
/Library/Ruby/Gems/2.6.0/gems/claide-1.0.3/lib/claide/command.rb:334:in `run'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.10.1/lib/cocoapods/command.rb:52:in `run'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.10.1/bin/pod:55:in `<top (required)>'
/usr/local/bin/pod:23:in `load'
/usr/local/bin/pod:23:in `<main>'

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[!] Oh no, an error occurred.

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Looking for related issues on cocoapods/cocoapods...

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  RuntimeError - [Xcodeproj] Unknown object version. #10984 [closed] [13 comments]
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[LXXuanCai]

why?

[paulb777]

See #10984

[dnkoutso]

gem update xcodeproj

[bassoonreed]

This worked for me - Xcode 13.2