I have created an extension for my UIViewController and I want to declare some variables which I can use through out the extension. Below is my code

```
extension UIViewController {

var mssgTopConstraint1: NSLayoutConstraint?
var mssgTopConstraint2: NSLayoutConstraint?
var mssgIconTop1: NSLayoutConstraint?
var mssgIconTop2: NSLayoutConstraint?
var isCheviClicked: Bool = false

}

```

I have this error extension may not contain stored properties for all five variables.