Error with FirebaseAuthProvider

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Step 2: Describe your environment

• Android device: my own samsung
• Android OS version: _____
• Google Play Services version: _____
• Firebase/Play Services SDK version: _____
• FirebaseUI version: ____

Step 3: Describe the problem:

###I have a problem with FirebaseAuthProvider:

I really don't know how to repair it.

In every tutorial or something like that nobody has that issue.
I updated everything.
Please help.

I already have this:

Steps to reproduce:

1. i just write Providers = new Firebase.Auth.FirebaseAuthProvider[]

Observed Results:

• it has error but i don't know why.

Expected Results:

• it should work like in tutorials without error

Relevant Code:

public class ConnectionFirebase
{
  public static FirebaseAuthClient ClientFirebase()
  {
      // Configure...
      var config = new FirebaseAuthConfig
      {
          ApiKey = "<API KEY>",
          AuthDomain = "<DOMAIN>.firebaseapp.com",
          Providers = new Firebase.Auth.FirebaseAuthProvider[]
          {
              // Add and configure individual providers
              new GoogleProvider().AddScopes("email"),
              new EmailProvider()
              // ...
          },
      };

      // ...and create your FirebaseAuthClient
      var client = new FirebaseAuthClient(config);

      return client;
  }
}