iOS Error An empty result was returned from GMVDetector in VisionFaceDetector.

[lordkkjmix]

Hello,
i'm faced this error when i use VisonFaceDetector in ios Device
Before update to flutter 1.20 and iOS 14 all work fine.

Not Problem in Android (FaceDectector work well).
[Firebase/MLKit][I-MLK009001] An empty result was returned from GMVDetector in VisionFaceDetector.

Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 1.20.3, on Mac OS X 10.15.7 19H2, locale fr-CI)

[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.0-rc3)
[✓] Xcode - develop for iOS and macOS (Xcode 12.0.1)
[!] Android Studio (version 3.6)
✗ Flutter plugin not installed; this adds Flutter specific functionality.
✗ Dart plugin not installed; this adds Dart specific functionality.
[✓] VS Code (version 1.50.0)
[✓] Connected device (2 available)

! Doctor found issues in 1 category.