not working on my Xcode?

Assignment

Create a base class called Shape which will have 2 properties: sides and name Create a subclass called Square, it will also have 2 properties called: sideLength and area. The area property will be a computed property with getter and setter methods. Add a designated initializer to Square which accept all three properties: sides, name and sideLength Add a convenience initializer to Square that will accept only the sideLength and provide default values. 4 for sides and “Square” for name Create an instance of Square using the convenience initializer?

MY Answer same as shown in the video by Amit.

class Shape { let side: Int let name: String

init (side: Int, name: String){

    self.side = side
    self.name = name


}

}

class Square: Shape { var sideLength: Double = 0.0 var area: Double = 0.0 {

get {
return sideLength * sideLength

}
set {
sideLength = sqrt(newValue)
}
}

init(name: String, side: Int, sideLength: Double){


self.sideLength = sideLength
super.init(sides: sides, name: name)
}

convenience init(sideLength: Double) {
    self.init (name: "square", side: 4,  sideLength: sideLength)
}

}

let square = Square(sideLength: 20) square.name square.side square.sideLength square.area square.area = 100 square.sideLength

still getting error at two stages -->

1)

super.init(sides: sides, name: name)

error = use of unresolved identifier

2)

var area: Double = 0.0 {

error = cannot call vale of non-funtional type???