flutter unable to load asset with correct settings

Question

this is my asset folder structure:

pubspec.yaml contents:

where that I use icon:

everything is right but I don't know why still it doesn't work:

Answer 1

It happens multiple time while developing with flutter. Steps which I usually do to solve this kind of issue:

->Restart the IDE and run pub get again (it works sometime).

->Run flutter clean, and re-run the App(It clears build cache of the App). It worked in most of the cases.