@IBDesignable display error in interface builder

I have a custom view with an image in it. And I get an error when the interface creator tries to render the custom view.

I have 6 of these views and I am getting 3 different errors.

• Failed to update auto-layout status: cocoa touch interface builder tool crashed.

• Failed to display CustomView instance: Rendering the view for longer than 200ms. Your drawing code can suffer from sloe performance.

• Failed to display CustomView instance: Assignable agent crashed.

And when I debug the view it crashes on the UIimage. and I get the error:

Topic 1: EXC_BAD_INSTRUCTION (code = EXC_I386_INVOP, subcode = 0x0)

How can I fix this?

thank

CODE:

@IBDesignable
class UIProgressButton: UIAnimatedButton {

//it crashed here
@IBInspectable
var icon: UIImage = UIImage(named: "feet")!{
    didSet {
        setupView()
    }
}

required init(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)

    setupView()
}


override init(frame: CGRect) {
    super.init(frame: frame)

    setupView()
}


let iconLayer = CALayer()
func setupView(){

    iconLayer.frame = CGRectMake(0, 5, self.frame.height-10, self.frame.height-10)
    iconLayer.contents = self.icon.CGImage
    self.layer.addSublayer(iconLayer)
}

}