I have added images to asset folder and pubspec.yaml too. It displayed perfectly fine early, but after few days an exception occurs with all the images in folder.

Exception messages are like this
════════ Exception caught by image resource service ════════════════════════════
Unable to load asset: “assets/warning_lights/seat_belt.png”.
════════════════════════════════════════════════════════════════════════════════

Code and exception