undefined_constructor_in_initializer

The class '{0}' doesn't have a constructor named '{1}'.

The class '{0}' doesn't have an unnamed constructor.

The analyzer produces this diagnostic when a superclass constructor is invoked in the initializer list of a constructor, but the superclass doesn't define the constructor being invoked.

The following code produces this diagnostic because A doesn't have an unnamed constructor:

class A {
  A.n();
}
class B extends A {
  B() : super();
}

The following code produces this diagnostic because A doesn't have a constructor named m:

class A {
  A.n();
}
class B extends A {
  B() : super.m();
}

If the superclass defines a constructor that should be invoked, then change the constructor being invoked:

class A {
  A.n();
}
class B extends A {
  B() : super.n();
}

If the superclass doesn't define an appropriate constructor, then define the constructor being invoked:

class A {
  A.m();
  A.n();
}
class B extends A {
  B() : super.m();
}

Unless stated otherwise, the documentation on this site reflects Dart 3.8.0. Page last updated on 2025-05-08. View source or report an issue.