After I setup my Flutter application with Firebase and connecting the app with the Firebase console, I am not able to run the application in the iOS simulator.

My system description is – 2017 Macbook Pro Intel i5 & MacOS 13.6.7.

Simulator – iPhone 12 Pro Max iOS 17.2

The debug console shows the main error as –

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

Ruby version on my mac after running ruby -v

ruby 2.6.10p210 (2022-04-12 revision 67958) [universal.x86_64-darwin22]

The application runs fine without setting up the Firebase. I tried a lot of things but still unable to figure out the solution.

The warning message in the debug console is –

Launching lib/main.dart on iPhone 12 Pro Max in debug mode...
CocoaPods' output:
↳
      Preparing

    Analyzing dependencies

    Inspecting targets to integrate
      Using `ARCHS` setting to build architectures of target `Pods-Runner`: (``)
      Using `ARCHS` setting to build architectures of target `Pods-RunnerTests`: (``)

    Fetching external sources
    -> Fetching podspec for `Flutter` from `Flutter`
    -> Fetching podspec for `firebase_core` from `.symlinks/plugins/firebase_core/ios`
    firebase_core: Using Firebase SDK version '10.27.0' defined in 'firebase_core'

    Resolving dependencies of `Podfile`

Error output from CocoaPods:
↳
    /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require': cannot load such file -- ffi_c (LoadError)
        from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
        from /Library/Ruby/Gems/2.6.0/gems/ffi-1.17.0-arm64-darwin/lib/ffi.rb:5:in `rescue in <top (required)>'
        from /Library/Ruby/Gems/2.6.0/gems/ffi-1.17.0-arm64-darwin/lib/ffi.rb:2:in `<top (required)>'
2
        from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'

...
...
...

from /usr/local/bin/pod:23:in `<main>'
    /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require': dlopen(/Library/Ruby/Gems/2.6.0/gems/ffi-1.17.0-arm64-darwin/lib/2.6/ffi_c.bundle, 0x0009): tried: '/Library/Ruby/Gems/2.6.0/gems/ffi-1.17.0-arm64-darwin/lib/2.6/ffi_c.bundle' (mach-o file, but is an incompatible architecture (have 'arm64', need 'x86_64h' or 'x86_64')), '/System/Volumes/Preboot/Cryptexes/OS/Library/Ruby/Gems/2.6.0/gems/ffi-1.17.0-arm64-darwin/lib/2.6/ffi_c.bundle' (no such file), '/Library/Ruby/Gems/2.6.0/gems/ffi-1.17.0-arm64-darwin/lib/2.6/ffi_c.bundle' (mach-o file, but is an incompatible architecture (have 'arm64', need 'x86_64h' or 'x86_64')) - /Library/Ruby/Gems/2.6.0/gems/ffi-1.17.0-arm64-darwin/lib/2.6/ffi_c.bundle (LoadError)


...
...
...

from /usr/local/bin/pod:23:in `<main>'

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

Exited (1).

I believe that there is some issue with how ruby is working with the arm64 and x86_64 archs in my system but I’m unable to figure out how to resolve the issue.

These are the things I tried after referring multiple documents and resources –

1. Updated and flutter cocoapods –

flutter clean
rm -Rf ios/Pods
rm -Rf ios/.symlinks
rm -Rf ios/Flutter/Flutter.framework
rm -Rf ios/Flutter/Flutter.podspec
flutter pub get
cd ios
pod install # (or on an M1+ mac: arch -x86_64 pod install)
cd ..
flutter build ios
flutter run

2. Installed ffi in terminal for x86_64 architecture –

sudo arch -x86_64 gem install ffi

3. Installed libffi using homebrew –

brew install libffi
gem install ffi

4. Changed the iOS Platform in the Podfile of the Flutter project

platform :ios, '17.0'

5. Install ruby 3.3.3 –

brew install [email protected] libyaml gmp readline

RUBY_CONFIGURE_OPTS="--with-openssl-dir=$(brew --prefix [email protected]) --disable-install-doc" rbenv install 3.3.3