ios - Class AMSupportURLConnectionDelegate is implemented in both

Question

I'm trying to build a flutter app on M1 mac and getting the following error.

$ flutter build ios --release
Building XXX for device (ios-release)...
Automatically signing iOS for device deployment using specified development team in Xcode project: XXX
Running pod install...                                             13.2s
Running Xcode build...
Xcode build done.                                            6.7s
Failed to build iOS app
Error output from Xcode build:
?
    objc[65074]: Class AMSupportURLConnectionDelegate is implemented in both ?? (0x1f66de518) and ?? (0x1160d82b8). One
    of the two will be used. Which one is undefined.
    objc[65074]: Class AMSupportURLSession is implemented in both ?? (0x1f66de568) and ?? (0x1160d8308). 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: The linked framework 'Pods_Runner.framework' is missing one or more architectures required by this target:
    armv7. (in target 'Runner' from project 'Runner')

Encountered error while building for device.

Here is my flutter doctor -v

flutter doctor -v
[?] Flutter (Channel stable, 1.22.4, on macOS 11.0 20A2411 darwin-arm, locale en-AU)
    ? Flutter version 1.22.4 at /Users/mlee/development/flutter
    ? Framework revision 1aafb3a8b9 (3 weeks ago), 2020-11-13 09:59:28 -0800
    ? Engine revision 2c956a31c0
    ? Dart version 2.10.4


[?] Android toolchain - develop for Android devices (Android SDK version 30.0.2)
    ? Android SDK at /Users/mlee/Library/Android/sdk
    ? Platform android-30, build-tools 30.0.2
    ? Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
    ? Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6915495)
    ? All Android licenses accepted.

[?] Xcode - develop for iOS and macOS (Xcode 12.2)
    ? Xcode at /Applications/Xcode.app/Contents/Developer
    ? Xcode 12.2, Build version 12B45b
    ? CocoaPods version 1.10.0

[!] Android Studio (version 4.1)
    ? Android Studio at /Applications/Android Studio.app/Contents
    ? Flutter plugin not installed; this adds Flutter specific functionality.
    ? Dart plugin not installed; this adds Dart specific functionality.
    ? Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6915495)

[?] VS Code (version 1.51.1)
    ? VS Code at /Applications/Visual Studio Code.app/Contents
    ? Flutter extension version 3.16.0

[?] Connected device (2 available)
   

! Doctor found issues in 1 category.

Answer 1

I had the same issue. I saw the same error when I ran flutter build ios.

The error message was displayed red color on my VS code terminal, but it was kind of misleading. I found it was not the main issue.

The actual issue should be on the following error section.

So, please run flutter build ios --verbose and read the output carefully.

In my situation, there were other issues of the failure of flutter build ios. The issues were like forget to put in GoogleService-Info.plist or iOS target version is less than the requirement of flutter packages.