My app looks different in debug and release mode. Video of it:- https://github.com/flutter/flutter/issues/92491
That grey error is because you have an error, try looking at your logs.
and also is your app data is from backend? and also yes then please check you have added internet permission in Androidmanifest.xml file
Answered By – khunt arpit
Answer Checked By – Gilberto Lyons (FlutterFixes Admin)