Need some help! Failed to produce diagnostic for expression error

Hey y'all, im semi new to the coding world and have just come across this error: Failed to produce diagnostic for expression; please submit a bug report (https://swift.org/contributing/#reporting-bugs) ive been building for a little while and can't figure out why. Ive rebuilt and tried everything. Any help would be appreciated!

This is the code: import SwiftUI import Combine

struct LoginView: View { @EnvironmentObject var authManager: AuthenticationManager @State private var email = "" @State private var password = "" @State private var showingAlert = false @State private var alertMessage = "" @State private var keyboardHeight: CGFloat = 0

var body: some View {
    GeometryReader { geometry in
        NavigationView {
            ZStack {
                LinearGradient(gradient: Gradient(colors: [Color.red, Color.black]), startPoint: .top, endPoint: .bottom)
                    .edgesIgnoringSafeArea(.all)
                
                VStack {
                    Image("GottaDraftEmAll")
                        .resizable()
                        .scaledToFit()
                        .frame(width: geometry.size.width * 0.8, height: geometry.size.height * 0.1)
                        .padding(.top, 25)
                    
                    Spacer()
                    
                    Image("pokeball")
                        .resizable()
                        .scaledToFit()
                        .frame(width: geometry.size.width * 0.6, height: geometry.size.width * 0.6)
                        .padding(.bottom, 20)
                    
                    VStack(spacing: 15) {
                        TextField("", text: $email)
                            .padding()
                            .background(Color.white.opacity(0.8))
                            .cornerRadius(10)
                            .padding(.horizontal, 20)
                            .foregroundColor(.black)
                            .overlay(
                                HStack {
                                    Text(email.isEmpty ? "Email" : "")
                                        .foregroundColor(Color.black.opacity(0.7))
                                        .padding(.leading, 25)
                                    Spacer()
                                }
                            )
                        
                        SecureField("", text: $password)
                            .padding()
                            .background(Color.white.opacity(0.8))
                            .cornerRadius(10)
                            .padding(.horizontal, 20)
                            .foregroundColor(.black)
                            .overlay(
                                HStack {
                                    Text(password.isEmpty ? "Password" : "")
                                        .foregroundColor(Color.black.opacity(0.7))
                                        .padding(.leading, 25)
                                    Spacer()
                                }
                            )
                    }
                    .padding(.top, 50)
                    
                    Button(action: {
                        authManager.signIn(email: email, password: password) { success, error in
                            if !success {
                                alertMessage = error ?? "An unknown error occurred"
                                showingAlert = true
                            }
                        }
                    }) {
                        Text("LOGIN")
                            .font(.headline)
                            .foregroundColor(.white)
                            .padding()
                            .frame(maxWidth: .infinity)
                    }
                    .buttonStyle(GlowGradientButtonStyle())
                    .padding(.horizontal, 20)
                    .padding(.top, 20)
                    
                    NavigationLink(destination: SignUpView()) {
                        Text("Don't have an account? Sign Up")
                            .foregroundColor(.white)
                    }
                    .padding(.top, 10)
                    
                    Spacer()
                }
                .padding(.bottom, keyboardHeight)
            }
            .onAppear {
                NotificationCenter.default.addObserver(forName: UIResponder.keyboardWillShowNotification, object: nil, queue: .main) { notification in
                    if let value = notification.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? CGRect {
                        self.keyboardHeight = value.height
                    }
                }
                
                NotificationCenter.default.addObserver(forName: UIResponder.keyboardWillHideNotification, object: nil, queue: .main) { _ in
                    self.keyboardHeight = 0
                }
            }
            .onDisappear {
                NotificationCenter.default.removeObserver(self, name: UIResponder.keyboardWillShowNotification, object: nil)
                NotificationCenter.default.removeObserver(self, name: UIResponder.keyboardWillHideNotification, object: nil)
            }
            .alert(isPresented: $showingAlert) {
                Alert(title: Text("Login Error"), message: Text(alertMessage), dismissButton: .default(Text("OK")))
            }
        }
    }
}

}