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I upgraded Flutter to latest. Following is the doctor output

Doctor summary (to see all details, run flutter doctor -v): [✓] Flutter (Channel beta, v0.8.2, on Mac OS X 10.14 18A326h, locale en-US) [✓] Android toolchain - develop for Android devices (Android SDK 28.0.1) [✓] iOS toolchain - develop for iOS devices (Xcode 10.0) [✓] Android Studio (version 3.1) [✓] VS Code (version 1.27.1)

When I run the app with target to iOS simulator, I get this 

Launching lib/main.dart on iPhone XS Max in debug mode... Starting Xcode build... Xcode build done. Failed to build iOS app Error output from Xcode build: ↳ ** BUILD FAILED ** Xcode's output: ↳ error: Multiple commands produce '/Users/kalehv/dev/todo/todo-flutter/build/ios/Debug-iphonesimulator/Runner.app/Frameworks/Flutter.framework': 1) Target 'Runner' has copy command from '/Users/kalehv/dev/todo/todo-flutter/ios/Flutter/Flutter.framework' to '/Users/kalehv/dev/todo/todo-flutter/build/ios/Debug-iphonesimulator/Runner.app/Frameworks/Flutter.framework' 2) That command depends on command in Target 'Runner': script phase “[CP] Embed Pods Frameworks” warning: The use of Swift 3 @objc inference in Swift 4 mode is deprecated. Please address deprecated @objc inference warnings, test your code with “Use of deprecated Swift 3 @objc inference” logging enabled, and then disable inference by changing the "Swift 3 @objc Inference" build setting to "Default" for the "Runner" target. (in target 'Runner') warning: ignoring duplicated output file: '/Users/kalehv/dev/todo/todo-flutter/build/ios/Debug-iphonesimulator/Runner.app/Frameworks/Flutter.framework' (in target 'Runner') note: Using new build systemnote: Planning buildnote: Constructing build description Could not build the application for the simulator. Error launching application on iPhone XS Max.
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3 Answers 3

Reset to default
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I think this would help at least it worked for me url.

Open your Xcode and there is File upper-left next to Apple icon, then open Workspace Settings and change the build system to Legacy Build System.

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Thank you. That worked. Now I wish libimobiledevice fix new iPhone XS family UDID recognition.
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I had the same problem, but when I changed to Legacy Build System I got a ton of Apple Mach-O Linker Error's instead.

I finally narrowed the problem down to a setting in Runner.xcodeproj/project.pbxproj (which can be manipulated from XCode in the Runner -> Build settings tab).

I had somehow set 

Build active architecture only - Debug No - Profile Yes - Release Yes

Changing it to 

Build active architecture only - Debug Yes - Profile Yes - Release Yes

solved the errors.

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Mannnnnnnn.... Thanks alot. I've almost wasted 1.5 day. Thanks mattt.
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I fix this By uncommit platform target in the Podfile inside ios folder, So it will be 9. Then you must change the platform target from Xcode to 9 this very important. after that do this Open your Xcode and there is File upper-left next to Apple icon, then open Workspace Settings and change the build system to Legacy Build System.

then do this post link

Hit the clean button project in Xcode and run it.

I hope this will help you.

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