No exact matches in reference to static method 'buildExpression'

Could you show code where error occurs ? Is buildExpression a method you defined ?

Of course! The error occurs on the line that says .environmentObject(registrationViewModel)

import SwiftUI

struct ContentView: View {
    @StateObject var viewModel = ContentViewModel()
    @StateObject var registrationViewModel = RegistrationViewModel()
    
    var body: some View {
        Group {
            if viewModel.userSession == nil {
                LoginView()
                    .environmentObject(registrationViewModel)
            } else if let currentUser = viewModel.currentUser {
                MainTabView(user: currentUser)
            }
        }
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
            ContentView()
    }
}
 

Ok. I posted It below so I was able to fit all the code in it.