Unable to load asset: assets/images/failed.png code example

Example 1: flutter failed to load asset image

flutter:
  assets:
    - assets/images/img.png

Example 2: Unhandled Exception: Unable to load asset

flutter:

[2 whitespaces or 1 tab]assets:
[4 whitespaces or 2 tabs]- images/pizza1.png
[4 whitespaces or 2 tabs]- images/pizza0.png