Flutter Launcher Icons - A package which simplifies the task of updating your Flutter app's launcher icon. Fully flexible, allowing you to choose what platform you wish to update the launcher icon for and if you want, the option to keep your old launcher icon in case you want to revert back sometime in the future. Maintainer: @MarkOSullivan94
I was getting the same error when building an ipa, here is how I resolved it:
Go into the ios folder, and click on Runner.xcworkspace to open the Flutter project in Xcode.
In Xcode, toggle the blue icon with Runner, inside of it there is another folder named Runner, open it too.
Click on Assets. Then you will see that your icon set is named AppIcon. Copy it, and name the copy LaunchImage. If LaunchImage already exists and it's empty, simply delete it and proceed to rename.
Now, rebuild your project, the error should go away.
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