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Hi,

I'm trying to debug the project but are receiving some erros:

`C:\flutter.pub-cache\hosted\pub.dartlang.org\firebase_auth-0.8.4+5\android\src\main\java\io\flutter\plugins\firebaseauth\FirebaseAuthPlugin.java:9: error: cannot find symbol

import androidx.annotation.NonNull; ^ symbol: class NonNull location: package androidx.annotation C:\flutter.pub-cache\hosted\pub.dartlang.org\firebase_auth-0.8.4+5\android\src\main\java\io\flutter\plugins\firebaseauth\FirebaseAuthPlugin.java:10: error: cannot find symbol import androidx.annotation.Nullable; ^ symbol: class Nullable location: package androidx.annotation C:\flutter.pub-cache\hosted\pub.dartlang.org\firebase_auth-0.8.4+5\android\src\main\java\io\flutter\plugins\firebaseauth\FirebaseAuthPlugin.java:754: error: cannot find symbol

private void reportException(Result result, @Nullable Exception exception) { ^ symbol: class Nullable location: class FirebaseAuthPlugin C:\flutter.pub-cache\hosted\pub.dartlang.org\firebase_auth-0.8.4+5\android\src\main\java\io\flutter\plugins\firebaseauth\FirebaseAuthPlugin.java:658: error: cannot find symbol public void onComplete(@NonNull Task task) { ^ symbol: class NonNull location: class FirebaseAuthPlugin.SignInCompleteListener C:\flutter.pub-cache\hosted\pub.dartlang.org\firebase_auth-0.8.4+5\android\src\main\java\io\flutter\plugins\firebaseauth\FirebaseAuthPlugin.java:677: error: cannot find symbol public void onComplete(@NonNull Task task) { ^ symbol: class NonNull location: class FirebaseAuthPlugin.TaskVoidCompleteListener C:\flutter.pub-cache\hosted\pub.dartlang.org\firebase_auth-0.8.4+5\android\src\main\java\io\flutter\plugins\firebaseauth\FirebaseAuthPlugin.java:695: error: cannot find symbol public void onComplete(@NonNull Task task) { ^ symbol: class NonNull location: class FirebaseAuthPlugin.GetSignInMethodsCompleteListener C:\flutter.pub-cache\hosted\pub.dartlang.org\firebase_auth-0.8.4+5\android\src\main\java\io\flutter\plugins\firebaseauth\FirebaseAuthPlugin.java:197: error: cannot find symbol

                  public void onComplete(@NonNull Task<AuthResult> task) {
                                          ^

symbol: class NonNull C:\flutter.pub-cache\hosted\pub.dartlang.org\firebase_auth-0.8.4+5\android\src\main\java\io\flutter\plugins\firebaseauth\FirebaseAuthPlugin.java:540: error: cannot find symbol public void onComplete(@NonNull Task task) { ^ symbol: class NonNull C:\flutter.pub-cache\hosted\pub.dartlang.org\firebase_auth-0.8.4+5\android\src\main\java\io\flutter\plugins\firebaseauth\FirebaseAuthPlugin.java:607: error: cannot find symbol public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) { ^ symbol: class NonNull 9 errors FAILURE: Build failed with an exception.

• What went wrong: Execution failed for task ':firebase_auth:compileDebugJavaWithJavac'.

Compilation failed; see the compiler error output for details.

• Try: Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

• Get more help at https://help.gradle.org

BUILD FAILED in 3m 20s

The Gradle failure may have been because of AndroidX incompatibilities in this Flutter app. See https://goo.gl/CP92wY for more information on the problem and how to fix it.

Gradle task assembleDebug failed with exit code 1 `

Got this compiler error from the loginpage.dart:

lib/loginpage.dart:110:57: Error: The method 'signInWithGoogle' isn't defined for the class 'firebase_auth::FirebaseAuth'.
Try correcting the name to the name of an existing method, or defining a method named 'signInWithGoogle'.
FirebaseAuth.instance.signInWithGoogle

Changing the code on line 109:

// From
FirebaseAuth.instance.signInWithGoogle(idToken: googleuser.idToken, accessToken: googleuser.accessToken).

// To
FirebaseAuth.instance.signInWithCustomToken(token: googleuser.idToken).

Allows the app to compile, but not sure if this the desired alternative and have yet to test on a device.