Firebase User re-authentication initialising error

问题

When any user wants to update his/her password from app, i want to update that password of same FCM user and for that i have tried below code which define in official doc.

here is the screenshot of that

Here is my code

func authenticateAndUpdateFCMUserPassword(strNewPassword: String) {
    let user = Auth.auth().currentUser
    var credential: AuthCredential

    // Prompt the user to re-provide their sign-in credentials
    user?.reauthenticate(with: credential) { error in
        if let error = error {
            // An error happened.
        } else {
            // User re-authenticated.
        }
    }

    Auth.auth().currentUser?.updatePassword(to: strNewPassword) { (error) in
        if error != nil {
            print("Error occur while updating password")
        }
        else {
            print("Password Updated Successfully")
        }
    }
}

But in above code i'm facing below error at user?.reauthenticate line

Cannot convert value of type '(_) -> ()' to expected argument type 'AuthDataResultCallback?' (aka 'Optional<(Optional, Optional) -> ()>')

so i re write that by below code

user?.reauthenticate(with: credential, completion: { (dataResult, errorr) in
    if errorr != nil {
        // An error happened.
    } else {
        // User re-authenticated.
    }
})

but in above code i'm facing below error