CocoaPods requires your terminal to be using UTF-8 encoding. Consider adding the following to ~/.profile. export LANG=en_US.UTF-8

Question

[!] An error occurred while processing the post-install hook of the Podfile.

undefined method `each_child' for #<Dir:0x00007ff3fa3555c0>
Did you mean?  each_slice

/Applications/FlutterSDK/flutter/packages/flutter_tools/bin/podhelper.rb:54:in `block in flutter_additional_ios_build_settings'
/Applications/FlutterSDK/flutter/packages/flutter_tools/bin/podhelper.rb:51:in `each'
/Applications/FlutterSDK/flutter/packages/flutter_tools/bin/podhelper.rb:51:in `flutter_additional_ios_build_settings'
/Users/macpro5/Downloads/oos-master/ios/Podfile:39:in `block (3 levels) in from_ruby'
/Users/macpro5/Downloads/oos-master/ios/Podfile:38:in `each'
/Users/macpro5/Downloads/oos-master/ios/Podfile:38:in `block (2 levels) in from_ruby'
/usr/local/lib/ruby/gems/2.5.0/gems/cocoapods-core-1.10.1/lib/cocoapods-core/podfile.rb:179:in `post_install!'
/usr/local/lib/ruby/gems/2.5.0/gems/cocoapods-1.10.1/lib/cocoapods/installer.rb:897:in `run_podfile_post_install_hook'
/usr/local/lib/ruby/gems/2.5.0/gems/cocoapods-1.10.1/lib/cocoapods/installer.rb:885:in `block in run_podfile_post_install_hooks'
/usr/local/lib/ruby/gems/2.5.0/gems/cocoapods-1.10.1/lib/cocoapods/user_interface.rb:145:in `message'
/usr/local/lib/ruby/gems/2.5.0/gems/cocoapods-1.10.1/lib/cocoapods/installer.rb:884:in `run_podfile_post_install_hooks'
/usr/local/lib/ruby/gems/2.5.0/gems/cocoapods-1.10.1/lib/cocoapods/installer.rb:329:in `block (2 levels) in create_and_save_projects'
/usr/local/lib/ruby/gems/2.5.0/gems/cocoapods-1.10.1/lib/cocoapods/installer/xcode/pods_project_generator/pods_project_writer.rb:61:in `write!'
/usr/local/lib/ruby/gems/2.5.0/gems/cocoapods-1.10.1/lib/cocoapods/installer.rb:328:in `block in create_and_save_projects'
/usr/local/lib/ruby/gems/2.5.0/gems/cocoapods-1.10.1/lib/cocoapods/user_interface.rb:64:in `section'
/usr/local/lib/ruby/gems/2.5.0/gems/cocoapods-1.10.1/lib/cocoapods/installer.rb:307:in `create_and_save_projects'
/usr/local/lib/ruby/gems/2.5.0/gems/cocoapods-1.10.1/lib/cocoapods/installer.rb:299:in `generate_pods_project'
/usr/local/lib/ruby/gems/2.5.0/gems/cocoapods-1.10.1/lib/cocoapods/installer.rb:178:in `integrate'
/usr/local/lib/ruby/gems/2.5.0/gems/cocoapods-1.10.1/lib/cocoapods/installer.rb:166:in `install!'
/usr/local/lib/ruby/gems/2.5.0/gems/cocoapods-1.10.1/lib/cocoapods/command/install.rb:52:in `run'
/usr/local/lib/ruby/gems/2.5.0/gems/claide-1.0.2/lib/claide/command.rb:334:in `run'
/usr/local/lib/ruby/gems/2.5.0/gems/cocoapods-1.10.1/lib/cocoapods/command.rb:52:in `run'
/usr/local/lib/ruby/gems/2.5.0/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>'

/usr/local/lib/ruby/gems/2.5.0/gems/cocoapods-1.10.1/lib/cocoapods/installer.rb:899:in `rescue in run_podfile_post_install_hook'
/usr/local/lib/ruby/gems/2.5.0/gems/cocoapods-1.10.1/lib/cocoapods/installer.rb:896:in `run_podfile_post_install_hook'
/usr/local/lib/ruby/gems/2.5.0/gems/cocoapods-1.10.1/lib/cocoapods/installer.rb:885:in `block in run_podfile_post_install_hooks'
/usr/local/lib/ruby/gems/2.5.0/gems/cocoapods-1.10.1/lib/cocoapods/user_interface.rb:145:in `message'
/usr/local/lib/ruby/gems/2.5.0/gems/cocoapods-1.10.1/lib/cocoapods/installer.rb:884:in `run_podfile_post_install_hooks'
/usr/local/lib/ruby/gems/2.5.0/gems/cocoapods-1.10.1/lib/cocoapods/installer.rb:329:in `block (2 levels) in create_and_save_projects'
/usr/local/lib/ruby/gems/2.5.0/gems/cocoapods-1.10.1/lib/cocoapods/installer/xcode/pods_project_generator/pods_project_writer.rb:61:in `write!'
/usr/local/lib/ruby/gems/2.5.0/gems/cocoapods-1.10.1/lib/cocoapods/installer.rb:328:in `block in create_and_save_projects'
/usr/local/lib/ruby/gems/2.5.0/gems/cocoapods-1.10.1/lib/cocoapods/user_interface.rb:64:in `section'
/usr/local/lib/ruby/gems/2.5.0/gems/cocoapods-1.10.1/lib/cocoapods/installer.rb:307:in `create_and_save_projects'
/usr/local/lib/ruby/gems/2.5.0/gems/cocoapods-1.10.1/lib/cocoapods/installer.rb:299:in `generate_pods_project'
/usr/local/lib/ruby/gems/2.5.0/gems/cocoapods-1.10.1/lib/cocoapods/installer.rb:178:in `integrate'
/usr/local/lib/ruby/gems/2.5.0/gems/cocoapods-1.10.1/lib/cocoapods/installer.rb:166:in `install!'
/usr/local/lib/ruby/gems/2.5.0/gems/cocoapods-1.10.1/lib/cocoapods/command/install.rb:52:in `run'
/usr/local/lib/ruby/gems/2.5.0/gems/claide-1.0.2/lib/claide/command.rb:334:in `run'
/usr/local/lib/ruby/gems/2.5.0/gems/cocoapods-1.10.1/lib/cocoapods/command.rb:52:in `run'
/usr/local/lib/ruby/gems/2.5.0/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>'

Error output from CocoaPods: ↳ WARNING: CocoaPods requires your terminal to be using UTF-8 encoding. Consider adding the following to ~/.profile:

    export LANG=en_US.UTF-8
    

Error running pod install Error launching application on iPhone 12 Pro Max.

Solution

just change your cocoapos version to 1.10.2 to solve your problem.

first uninstall your current version (whatever it is)

In my case, i downgraded from version 1.11.1

sudo gem uninstall cocoapods

Then just install the stable version (as of Nov 11, 2021)

sudo gem install cocoapods:1.10.2

and build your app again.

If still not working , delete the below from the build directory:

• Podfile
• Podfile.lock
• Pods (directory) and build.

It fixed it for me, twice in the last few days.