Cannot find a storyboard named 'Main' in bundle & UITabBarController

First of all, I decided to make my project with only UIKit. So I deleted 'Main' storyboard, Info.plist->Storyboard name, and Main storyboard file base name->Main. And I edited SceneDelegate.

So now I can display the single viewControllers, but when I try to set 'UITabBarController' to rootViewController, It cause this error(title). I tried to make UITabBarController in ViewController, UITabBarController in SceneDelegate and some more.

// BackgroundViewController for the rootViewController

import UIKit

class BackgroundViewController: UIViewController {
    
    let backgroundTabBarController = UITabBarController()

    override func viewDidLoad() {
        super.viewDidLoad()
        
        view.backgroundColor = .white
        createTabBar()
    }
}

extension BackgroundViewController {
    private func createTabBar() {
        view.backgroundColor = .white
        view.addSubview(backgroundTabBarController.view)
        
        let firstViewController = BookSearchViewController()
        let secondViewController = MainViewController()
        let thirdViewController = UserStatusViewController()
        let lastViewController = OrderViewController()
        
        firstViewController.tabBarItem = UITabBarItem(title: "Search", image: UIImage(systemName: "magnifyingglass.circle.fill"), selectedImage: UIImage(systemName: "magnifyingglass.circle"))
        secondViewController.tabBarItem = UITabBarItem(title: "Main", image: UIImage(systemName: "house.fill"), selectedImage: UIImage(systemName: "house"))
        thirdViewController.tabBarItem = UITabBarItem(title: "My", image: UIImage(systemName: "person.fill"), selectedImage: UIImage(systemName: "person"))
        lastViewController.tabBarItem = UITabBarItem(title: "Order", image: UIImage(systemName: "menucard.fill"), selectedImage: UIImage(systemName: "menucard"))
        
        backgroundTabBarController.viewControllers = [firstViewController, secondViewController, thirdViewController, lastViewController]
        backgroundTabBarController.selectedViewController = secondViewController
    }
}

// SceneDelegate

import UIKit

class SceneDelegate: UIResponder, UIWindowSceneDelegate {
    
    var window: UIWindow?

    func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
        guard let windowScene = (scene as? UIWindowScene) else { return }
        window = UIWindow(windowScene: windowScene)
        
        window?.rootViewController = BackgroundViewController()
        window?.makeKeyAndVisible()
    }
}

// Error code

Thread 1: "Could not find a storyboard named 'Main' in bundle NSBundle </Users/[MyDesktopName]/Library/Developer/CoreSimulator/Devices/[ApplicationName]/data/Containers/Bundle/Application/[ApplicationName]/BTY.app> (loaded)"

But anyone of this solve the problem. How can I make UITabBarController to rootViewController?

• Make UITabBarController in SceneDelegate
• Make new UIViewController that have UITabBarController and set to rootViewController
• Set ViewControllers with 'UINavigationController(rootViewController:)'
• Present UITabBarController from other viewController