Good day, I'am learning swiftUI since this week but at this point I'am seriously disappointed. I've been trying to fix this issue since +4hrs, but I don't get it... Maybe you guys will help me.. Error messages: ▶︎ HomePageView.swift:63:37 Missing argument for parameter 'forUser' in call ▶︎ HomePageView.swift:375:22 Missing argument for parameter 'dataManager' in call ▶︎ LoginPageView.swift:28:38 Missing argument for parameter 'dataManager' in call ▶︎ LoginPageView.swift:131:26 Value of type 'LoginPageView' has no member 'getUserData' Here you will have Code snippets: LoginPageView.swift import SwiftUI import CoreData import Firebase struct LoginPageView: View { @State private var email: String = "" @State private var password: String = "" @State private var isAuthenticated = false @State private var showAlert = false @State private var errorMessage: String = "" @Environment(\.scenePhase) private var scenePhase // Beobachtet den Lebenszyklus der Szene @ObservedObject var dataManager = UserDataManager() var body: some View { NavigationView { ZStack { Color(hex: "f6f1eb").edgesIgnoringSafeArea(.all) if isAuthenticated { HomePageView() } else { loginForm } } .navigationTitle(isAuthenticated ? "" : "") .navigationBarHidden(isAuthenticated) .onChange(of: scenePhase) { newPhase in if newPhase == .background { logout() } } .onAppear { checkAuthentication() } } } code-block HomePageView.swift struct HomePageView: View { @ObservedObject var dataManager: UserDataManager init(dataManager: UserDataManager) { self.dataManager = dataManager } var body: some View { NavigationView { ZStack { Color(hex: "f6f1eb") .edgesIgnoringSafeArea(.all) VStack { UserProfileView(userRole: dataManager.userRole, userEmail: dataManager.userEmail) .frame(height: 100) Divider() SidebarView() } } } .onAppear { dataManager.getUserData() } .navigationBarTitle("Split View") } } struct HomePageView_Previews: PreviewProvider { static var previews: some View { HomePageView() } } code-block DataManager.swift class UserDataManager: ObservableObject { @Published var userRole: String = "Loading..." @Published var userEmail: String = "Loading..." func getUserData(forUser userId: String) { let db = Firestore.firestore() db.collection("UserRole").document(userId).getDocument { (document, error) in if let document = document, document.exists { if let data = document.data() { if let role = data["Role"] as? String, let email = data["EMailAddress"] as? String { // Speichern Sie die Benutzerrolle und E-Mail-Adresse in Ihrem UserDataManager self.userRole = role self.userEmail = email } } } else { print("Document does not exist") } } } } code-block Thanks in advance for your help and insights. I appreciate your support and look forward to your responses.