This is an excerpt of my pubspec.yaml file:
flutter:
uses-material-design: true
fonts:
- family: Coiny
fonts:
- asset: fonts/Coiny-Regular
Whenever you make changes to pubspec.yaml
file, it is always a good idea to stop the ongoing dart process from your IDE and do a full restart.
If you do hot reload or hot restart, engine may not be able to fetch the newly added data to your file. If nothing works, you should use @Collin answer, uninstall and reinstall the app.