exc_bad_instruction exc_i386_invop when adding var randomColor now it will not go away

I get the error at funFactLabel.text = factBook.randomFact()

}

on the thread page

0x1118a1ab3 <+35>: callq 0x1118f7250 ; function signature specialization <Arg[0] = Exploded, Arg[1] = Exploded> of Swift.(_fatalErrorMessage (Swift.StaticString, Swift.StaticString, Swift.StaticString, Swift.UInt) -> ()).(closure #2) -> 0x1118a1ab8 <+40>: ud2
0x1118a1aba <+42>: movq $0x0, -0x10(%rbp)

in the debug panel

fatal error: unexpectedly found nil while unwrapping an Optional value

I don't know how to add files but here is the viewcontroller

import UIKit

class ViewController: UIViewController {

@IBOutlet weak var funFactLabel: UILabel!

let factBook = FackBook()
let colorWheel = ColorWheel()

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
    funFactLabel.text = factBook.randomFact()

}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
        }


@IBAction func showFunFact() {

    view.backgroundColor = colorWheel.randomColor()
    funFactLabel.text = factBook.randomFact()
}

}