The icons I selected appear to be undefined even though they are in the class. What is the reason for this?

Icon(
    Icons.password,
    color: iconColor,
    )

CodePudding user response：

Check if in your pubspec.yaml the section uses-material-design is set to true.

CodePudding user response：

Open your cmd or android studio terminal and type[flutter doctor, then flutter doctor --android-licenses] and accept all of the licenses that terminal suggest you.