Describe the bug
I ran the commands specified on GitHub to build on master. Below error happens and the build fails.

To switch channel run:

flutter channel master
flutter upgrade

(DONE)

Flutter doctor
Copy and paste the output of flutter doctor -v here

flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel master, 2.3.0-13.0.pre.111, on macOS 11.3.1 20E241 darwin-x64, locale fr-FR)
[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.3)
[✓] Xcode - develop for iOS and macOS
[✓] Chrome - develop for the web
[✓] Android Studio (version 4.2)
[✓] IntelliJ IDEA Community Edition (version 2017.3.5)
[✓] VS Code (version 1.56.2)
[✓] Connected device (2 available)

• No issues found!

To Reproduce
Steps to reproduce the behavior:
flutter channel master
flutter upgrade
cd gallery/
flutter config --enable-macos-desktop
flutter create .
flutter run -d macos

Expected behavior
launch of the app

Screenshots
If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• OS: OSX
• Browser chrome, firefox, safari

Smartphone (please complete the following information):

• Device: Fairphone 3+ Android

Additional context
Add any other context about the problem here.