Unity - The name 'auth' does not exist in the current context - firebase

Question

I am currently trying to create user authentication in unity and I am having some issues.
The code below is what I have at the moment and I keep receiving the error saying Auth does not exist in the current context.
Does anyone have any idea why this is? Probably a simple fix that I am just overlooking.
using UnityEngine;
using UnityEngine.UI;
using System.Collections;
using System;
using System.Text.RegularExpressions;
using Firebase;
using Firebase.Auth;
public class Register : MonoBehaviour {
public GameObject email;
public GameObject password;
public GameObject confPassword;
private string Email;
private string Password;
private string ConfPassword;
private string form;
private bool EmailValid = false;
private string[] Characters = {"a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z",
"A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z",
"1","2","3","4","5","6","7","8","9","0","_","-"};
public void RegisterButton(){
bool EM = false;
bool PW = false;
bool CPW = false;
if (Email != ""){
EmailValidation();
if (EmailValid){
if(Email.Contains("#")){
if(Email.Contains(".")){
EM = true;
} else {
Debug.LogWarning("Email is Incorrect");
}
} else {
Debug.LogWarning("Email is Incorrect");
}
} else {
Debug.LogWarning("Email is Incorrect");
}
} else {
Debug.LogWarning("Email Field Empty");
}
if (Password != ""){
if(Password.Length > 5){
PW = true;
} else {
Debug.LogWarning("Password Must Be atleast 6 Characters long");
}
} else {
Debug.LogWarning("Password Field Empty");
}
if (ConfPassword != ""){
if (ConfPassword == Password){
CPW = true;
} else {
Debug.LogWarning("Passwords Don't Match");
}
} else {
Debug.LogWarning("Confirm Password Field Empty");
}
if (EM == true&&PW == true&&CPW == true)
{
auth.CreateUserWithEmailAndPasswordAsync(email, password).ContinueWith(task => {
if (task.IsCanceled) {
Debug.LogError("CreateUserWithEmailAndPasswordAsync was canceled.");
return;
}
if (task.IsFaulted) {
Debug.LogError("CreateUserWithEmailAndPasswordAsync encountered an error: " + task.Exception);
return;
}
// Firebase user has been created.
Firebase.Auth.FirebaseUser newUser = task.Result;
Debug.LogFormat("Firebase user created successfully: {0} ({1})",
newUser.DisplayName, newUser.UserId);
});
}
}
// Update is called once per frame
void Update () {
if (Input.GetKeyDown(KeyCode.Tab)){
if (email.GetComponent<InputField>().isFocused){
password.GetComponent<InputField>().Select();
}
if (password.GetComponent<InputField>().isFocused){
confPassword.GetComponent<InputField>().Select();
}
}
if (Input.GetKeyDown(KeyCode.Return)){
if (Password != ""&&Email != ""&&Password != ""&&ConfPassword != ""){
RegisterButton();
}
}
Email = email.GetComponent<InputField>().text;
Password = password.GetComponent<InputField>().text;
ConfPassword = confPassword.GetComponent<InputField>().text;
}
void EmailValidation(){
bool SW = false;
bool EW = false;
for(int i = 0;i<Characters.Length;i++){
if (Email.StartsWith(Characters[i])){
SW = true;
}
}
for(int i = 0;i<Characters.Length;i++){
if (Email.EndsWith(Characters[i])){
EW = true;
}
}
if(SW == true&&EW == true){
EmailValid = true;
} else {
EmailValid = false;
}
}
}

Answer 1

I do not see you ever creating the variable auth?
While you refer to it here:
auth.CreateUserWithEmailAndPasswordAsync(email, password).ContinueWith(task =>
So I assume you will have to create a variable auth and instantiate it with something related to FireBase.Auth (unless I am overlooking something).