Running into an error. What am I doing wrong? This is my second project with the same issue. PLEASE HELP! import UIKit struct TextCellViewModel {   let text: String   let font: UIFont } enum SectionType {   case productPhotos(images: [UIImage])   case productInfo(viewModels: [TextCellViewModel])   case relatedProducts(viewModels: [RelatedProductTableViewCellViewModel])       var title: String? {     switch self {     case .relatedProducts:       return "Related Products"     default:       return nil     }   } } class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {       private let tableView: UITableView = {     let table = UITableView()     table.register(UITableViewCell.self, forCellReuseIdentifier: "cell")     table.register(PhotoCarouselTableViewCell.self, forCellReuseIdentifier: PhotoCarouselTableViewCell.identifier)     table.register(RelatedProductTableViewCell.self, forCellReuseIdentifier: RelatedProductTableViewCell.identifier)                return table   }()