[Solved] Cannot create a method in a extension

Sergio Bost Asks: Cannot create a method in a extension
Just would like to create my own version of toString on custom type.

Seems like I’m missing something here.

Code:
extension on WeatherResponse { 

@override
    String toString() {
       return "City Name is: $cityName";
     }
}

I get the error:

Code:
    The method doesn't override an inherited method.
Try updating this class to match the superclass, or removing the override annotation.dartoverride_on_non_overriding_member

Extensions can't declare members with the same name as a member declared by 'Object'.

Try specifying a different name for the member.dartextension_declares_member_of_object

The declaration 'toString' isn't referenced.
Try removing the declaration of 'toString'.

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