Error in a Flutter: null safety because dependencies don’t support null safety

Error: Cannot run with sound null safety, because the following dependencies
don't support null safety:

Unsound null safety

To resolve this issue run application using the below command:

flutter run --no-sound-null-safety

To be specific (say in chrome)

flutter run -d chrome --no-sound-null-safety

if you are using IntelliJ idea or android studio: do like below.

add --no-sound-null-safety in Aditional run args field

Thanks:

Hope this would be helpful.