MaterialShowcase/MaterialShowcase.swift:371: Fatal error: Unexpectedly found nil while implicitly unwrapping an Optional value

[HarshParekh03]

I have provided below code where is face crash in containerView function of initViews() and below is how i use in viewDidLoad() and viewWillAppear i also tried setting up in viewdidAppear but still facing the crash. Please help me with a solution as i have already implemented in client project.

let showcase = MaterialShowcase()

self.showcase.setTargetView(button: self.btnLogin)

override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
self.showcase.show {
print("Success")
}
}

func initViews() {
let center = calculateCenter(at: targetView, to: containerView)

addTargetRipple(at: center)
addTargetHolder(at: center)

// if color is not UIColor.clear, then add the target snapshot
if targetHolderColor != .clear {
  addTarget(at: center)
}

addBackground()

addInstructionView(at: center)
instructionView.layoutIfNeeded()

// Disable subview interaction to let users click to general view only
subviews.forEach({$0.isUserInteractionEnabled = false})

if isTapRecognizerForTargetView {
  //Add gesture recognizer for targetCopyView
  hiddenTargetHolderView.addGestureRecognizer(tapGestureRecoganizer())
  hiddenTargetHolderView.isUserInteractionEnabled = true
} else {
  // Add gesture recognizer for both container and its subview
  addGestureRecognizer(tapGestureRecoganizer())
  hiddenTargetHolderView.addGestureRecognizer(tapGestureRecoganizer())
  hiddenTargetHolderView.isUserInteractionEnabled = true
}

}