Flutter AMSupportURLConnectionDelegate is implemented in both ?? Error

Question

I am facing many issues since I migrated my project to an Apple Silicon mac. I finally managed to reduce the problems but not sure the answer to this.

Running "flutter pub get" in Flutter_the app copy 3...        760ms
Launching lib/main.dart on iPhone 11 in debug mode...
Running pod install...                                             986ms
Running Xcode build...                                                  
Xcode build done.                                            1.5s
Failed to build iOS app
Error output from Xcode build:
↳
   objc[95181]: Class AMSupportURLConnectionDelegate is implemented in both ?? (0x20ba238f0) and ??
   (0x1160dc2b8). One of the two will be used. Which one is undefined.
   objc[95181]: Class AMSupportURLSession is implemented in both ?? (0x20ba23940) and ?? (0x1160dc308). One
   of the two will be used. Which one is undefined.
   ** BUILD FAILED **


Xcode's output:
↳
   note: Using new build system
   note: Building targets in parallel
   note: Planning build
   note: Constructing build description
   error: /Users/gorkem/Documents/flutter_workspace/Flutter_the app copy 3/ios/Flutter/Debug.xcconfig:
   unable to open file (in target "Runner" in project "Runner") (in target 'Runner' from project 'Runner')
   error: /Users/gorkem/Documents/flutter_workspace/Flutter_the app copy 3/ios/Flutter/Debug.xcconfig:
   unable to open file (in target "Runner" in project "Runner") (in target 'Runner' from project 'Runner')
   error: /Users/gorkem/Documents/flutter_workspace/Flutter_the app copy 3/ios/Flutter/Debug.xcconfig:
   unable to open file (in target "Runner" in project "Runner") (in target 'Runner' from project 'Runner')
   warning: Unable to read contents of XCFileList '/Target Support
   Files/Pods-Runner/Pods-Runner-frameworks-Debug-output-files.xcfilelist' (in target 'Runner' from project
   'Runner')
   error: Unable to load contents of file list: '/Target Support
   Files/Pods-Runner/Pods-Runner-frameworks-Debug-input-files.xcfilelist' (in target 'Runner' from project
   'Runner')
   error: Unable to load contents of file list: '/Target Support
   Files/Pods-Runner/Pods-Runner-frameworks-Debug-output-files.xcfilelist' (in target 'Runner' from project
   'Runner')

Could not build the application for the simulator.
Error launching application on iPhone 11.

Is there any way to solve this. I am not sure if the problem is even written in there.

Answer 1

I was getting this error

Class AMSupportURLConnectionDelegate is implemented in both /usr/lib/libauthinstall.dylib

NOTE:

Try this first if you have updated to flutter 2.10 from <=2.8

flutter pub upgrade 

Solution: Please open podfile and update with this script

installer.pods_project.build_configurations.each do |config|
    config.build_settings["EXCLUDED_ARCHS[sdk=iphonesimulator*]"] = "arm64"
end

flutter clean
flutter pub get
cd ios
pod install  

or instead of last command you can try below for M1

arch -x86_64 pod install // for M1 

Run your app.

Answer 2

I was getting the same "error output from Xcode build" with my M1 macbook recently as well after updating to Flutter 2.x.

I was able to clear this issue on mine by doing the following:

• Change directory to your project's path and sub-directory:

your_project/build/ios/Debug-iphonesimulator/

• Run $ xattr -lr Runner.app
• Run $ xattr -cr Runner.app

Apparently flutter projects have extended attributes in project app bundles containing Finder info which causes an error.

I found these links that helped for reference. https://developer.apple.com/library/archive/qa/qa1940/_index.html https://github.com/flutter/flutter/issues/72492