Help / Black screen / virtual device / Flutter / Android Studio

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Please help, thank you : Problem with exportation Flare animation in Flutter, on Android Studio . When run app, black screen and this message
E/flutter ( 8387): [ERROR:flutter/lib/ui/ui_dart_state.cc(148)] Unhandled Exception: Unable to load asset: images/cercle.flr

So black screen on virtual devise...

I have followed the official's website's tutorial.
Android studio doesn't mention any bug on main.dart or pubspec.yalm.
The flr file works well on the 2D site.
It seam that when you export the file, it doesn't propose anymore "Flutter" engine.

In Android Studio, In the images directory, The cercle.flr file has an interrogation point, meaning the file type is unknown.
What can I do ?