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I'm making a Flutter plugin which must support macOS. However, when I want to create a plugin and run the plugin in the example app (even when I haven't edited the by Flutter generated code), Xcode throws the following error.

Unable to load contents of the file list: '/Users/admin/../example/macos/ephemeral/FlutterInputs.xcfilelist'

Unable to load contents of the file list: '/Users/admin/../example/macos/ephemeral/FlutterOutputs.xcfilelist'

Xcode error screenshot

This is my Flutter doctor:

Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel dev, 1.21.0-9.0.pre, on Mac OS X 10.15.3 19D76, locale
    nl-NL)
[✓] Android toolchain - develop for Android devices (Android SDK version 29.0.2)
[✓] Xcode - develop for iOS and macOS (Xcode 11.5)
[✓] Chrome - develop for the web
[✓] Android Studio (version 3.5)
[✓] VS Code (version 1.48.0)
[✓] Connected device (3 available)

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  • Images of error message may convey information beyond the text, but the text within them is not searchable or accessible. Please edit the question to include the text of the error message. Commented Aug 17, 2020 at 19:46

5 Answers 5

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23

I found another solution: Run the flutter build command flutter build macos before build in Xcode, then these input/out files appears.

  • FlutterInputs.xcfilelist
  • FlutterOutputs.xcfilelist
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1 Comment

This worked for me. Thanks!
2 
1. flutter clean
2. delete 'Pods/', 'Podfile.lock', 'runner.xcworkspace'
3. pod deintegrate
4. flutter pub get
5. pod install

These commands in sequence did the job for me

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1 Comment

This worked for me. Make sure to cd to macos folder before running pod deintegrate
0

I solved this issue. When I created a Flutter Plugin these files weren't created. But when I created a Flutter Project these files where. When I copy/pasted those files to my plugin, the project build successfully!

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0

I fixed it using the correct version of flutter which matching with my project dependency. I used the latest version of a flutter but my project is not supporting that version so downgrade the version and the issue is resolved.

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In my case I had to make sure arm64 is set as Excluded Architectures field in Xcode Build Settings:

  1. Open Runner.xcworkspace in Xcode
  2. Select Runner project from Project navigator
  3. Select Runner under PROJECT section
  4. Click on Build Settings
  5. Set arm64 for Excluded Architectures field
  6. Repeat for Pods

Note: this only applies for Apple Silicon Macs.

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1 Comment

I tried this and the build failed with the message: "A build only device cannot be used to run this target."

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