redirect_to_missing_constructor

The constructor '{0}' couldn't be found in '{1}'.

The analyzer produces this diagnostic when a constructor redirects to a constructor that doesn't exist.

The following code produces this diagnostic because the factory constructor in A redirects to a constructor in B that doesn't exist:

class A {
  factory A() = B.name;
}

class B implements A {
  B();
}

If the constructor being redirected to is correct, then define the constructor:

class A {
  factory A() = B.name;
}

class B implements A {
  B();
  B.name();
}

If a different constructor should be invoked, then update the redirect:

class A {
  factory A() = B;
}

class B implements A {
  B();
}

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.