ios – UIKIT CollectionView Header Error (Headerview nil error)

I need to put the header of the gathering view, however I get an error each time I put the header title label worth.
There isn’t a header view, so there’s an erre saying that the non-compulsory worth needs to be unwrapped, however I can not determine it out.
Please assist me.
I need to see the header view.

ERROR : Thread 1: Deadly error: Unexpectedly discovered nil whereas implicitly unwrapping an Elective worth

Here is My Code

class TwenyOneViewController: UIViewController {

    
    @IBOutlet weak var collectionView: UICollectionView!
    
    
    override func viewDidLoad() {
        tremendous.viewDidLoad()
        collectionView.autoresizingMask = [.flexibleHeight, .flexibleWidth]
        collectionView.dataSource = self
        collectionView.delegate = self
        self.collectionView.collectionViewLayout = createLayout()
        //헤더 설정
        collectionView.register(HeaderCollectionReusableView.self, forSupplementaryViewOfKind: UICollectionView.elementKindSectionHeader, withReuseIdentifier: "HeaderCollectionReusableView")
        
    }
    
    

    
}

//MARK: - CollectionView Format 설정
extension TwenyOneViewController {
    // 콤포지셔널 레이아웃 설정
    fileprivate func createLayout() -> UICollectionViewLayout {
        // 레이아웃 생성 - 섹션 > 아이템 > 그룹 이렇게 포함됨
        let structure = UICollectionViewCompositionalLayout{
            (sectionIndex: Int, layoutEnvironMent: NSCollectionLayoutEnvironment) -> NSCollectionLayoutSection? in
            //아이템 사이즈
            let itemSize = NSCollectionLayoutSize(widthDimension: .fractionalWidth(0.9), heightDimension: .fractionalHeight(1.0))
            let merchandise = NSCollectionLayoutItem(layoutSize: itemSize)
            //아이템 간 간격 설정
            merchandise.contentInsets = NSDirectionalEdgeInsets(prime: 10, main: 5, backside: 5, trailing: 5)
            
            //그룹 사이즈
            let groupSize = NSCollectionLayoutSize(widthDimension: .fractionalWidth(1.0), heightDimension: .estimated(160))
            // 그룹 만들기
            let group = NSCollectionLayoutGroup.horizontal(layoutSize: groupSize, subitem: merchandise, depend: 3)
            // 그룹으로 섹션 만들기
            let part = NSCollectionLayoutSection(group: group)
            //섹션에 대한 간격 설정
            part.contentInsets = NSDirectionalEdgeInsets(prime: 10, main: 20, backside: 20, trailing: 20)
            part.orthogonalScrollingBehavior = .steady
            
            //섹션 헤더
            
            let titleSize = NSCollectionLayoutSize(widthDimension: .fractionalWidth(1.0),
                                                  heightDimension: .estimated(30))
            let titleSupplementary = NSCollectionLayoutBoundarySupplementaryItem(
                layoutSize: titleSize,
                elementKind: UICollectionView.elementKindSectionHeader,
                alignment: .prime)
            print("=-----(titleSupplementary)")
            part.boundarySupplementaryItems = [titleSupplementary]
            return part
            
        }
        return structure
    }
    
}

//MARK: - UICollectionViewDataSource
extension TwenyOneViewController: UICollectionViewDataSource{
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection part: Int) -> Int {
        return 4
    }
    
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        guard let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "WorkCollectionViewCell", for: indexPath) as? WorkCollectionViewCell else { return UICollectionViewCell() }
        cell.imageView.picture = UIImage(systemName: "rectangle.and.pencil.and.ellipsis")
        cell.titleLabel.textual content = "타이틀 (indexPath.row)"
        cell.descriptionLabel.textual content = "서브 (indexPath.row)"
        //셀 그림자 설정
        cell.layer.borderWidth = CGFloat(1)
        cell.layer.shadowColor = UIColor.grey.cgColor
        cell.layer.shadowOffset = CGSize(width: 4, peak: 5)
        cell.layer.shadowRadius = 2
        cell.layer.shadowOpacity = 0.2
        cell.layer.masksToBounds = false
        return cell
    }
    
    //섹션의 헤더 사용하기 위해 구현
    func collectionView(_ collectionView: UICollectionView, viewForSupplementaryElementOfKind type: String, at indexPath: IndexPath) -> UICollectionReusableView {
        change type {
          // 1
          case UICollectionView.elementKindSectionHeader:
            // 2
           
//             Configure the header view right here if wanted
            let headerView = collectionView.dequeueReusableSupplementaryView(
              ofKind: type,
              withReuseIdentifier: "HeaderCollectionReusableView",
              for: indexPath)

            // 3
            guard let typedHeaderView = headerView as? HeaderCollectionReusableView
            else { return headerView }

            // 4
            typedHeaderView.titleLabel.textual content = "수상별 목록"
            return typedHeaderView
          default:
            // 5
            assert(false, "Invalid factor kind")
          }
    }
    func collectionView(_ collectionView: UICollectionView, structure collectionViewLayout: UICollectionViewLayout, referenceSizeForHeaderInSection part: Int) -> CGSize{
           // Exhibits solely the header of the third part
        let dimension = CGSize(width: 20, peak: 20)
           return part == 2 ? dimension : .zero  // Change desiredSize with the dimensions of the seen header
        }
    
}