What did I do wrong here? [migrated]

What am I doing wrong here?

class NamedShape {
    var numberOfSides: Int = 0
    var name: String

    init(name: String) {
        self.name = name
    }

    func simpleDescription() -> String {
        return "A shape with \(numberOfSides) sides."
    }}


class Circle: NamedShape{
    var radius: Double

Here it says:"Cannot override with a stored property 'name'

var name: String

init(radius: Double, name: String){
    self.radius = radius
    super.init(name: name)
    }
func area(radius: Double) ->Double{
    var area: Double = radius * radius * 3.14
    return area
}
override func simpleDescription() -> String {

Here it says that 'name' is ambiguous

    return "A circle by the name of \(name)with the area of \(area(radius))"
}
}
let test = Circle(radius:5.1,name: myCircle)