Error: The parameter 'author' can't have a value of 'null' because of its type 'String', but the implicit default value is 'null'.

[drsimplegraffiti]

Error: The parameter 'author' can't have a value of 'null' because of its type 'String', but the implicit default value is 'null'.

Got this error on lesson 18 when i tried using the class to create the quote blueprint

[agada-nathan]

class Quote{
String? text;
String? author;
Quote({this.text, this.author});
}