non_generative_constructor

The generative constructor '{0}' is expected, but a factory was found.

The analyzer produces this diagnostic when the initializer list of a constructor invokes a constructor from the superclass, and the invoked constructor is a factory constructor. Only a generative constructor can be invoked in the initializer list.

The following code produces this diagnostic because the invocation of the constructor super.one() is invoking a factory constructor:

class A {
  factory A.one() = B;
  A.two();
}

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

Change the super invocation to invoke a generative constructor:

class A {
  factory A.one() = B;
  A.two();
}

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

If the generative constructor is the unnamed constructor, and if there are no arguments being passed to it, then you can remove the super invocation.