Errors on flutter run

[aclima01]

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
`