Project won't run with flutter run command

[agaragon]

I tried to run the command 'flutter run' and got several errors. I locally fixed the problem by replacing:

dependencies:
flutter:
sdk: flutter

cupertino_icons: ^1.0.2
snippet_coder_utils: ^1.0.12
dropdown_search: ^5.0.5
flutter_html: ^2.2.1
email_validator: ^2.1.17
syncfusion_flutter_datepicker: ^20.4.44

By:

dependencies:
flutter:
sdk: flutter

cupertino_icons: ^1.0.2
snippet_coder_utils: ^1.0.12
dropdown_search: 5.0.5
flutter_html: ^2.2.1
email_validator: ^2.1.17
syncfusion_flutter_datepicker: 20.4.44

I made a PR with the fix.

#2