Мое приложение Flutter больше не компилируется из-за ошибок аутентификации облачного хранилища и Firebase

Я потратил дни, пытаясь отладить свое приложение с помощью Firebase. Раньше все работало нормально только на прошлой неделе, когда я обновил много всего; android studio, флаттер, плагины и т. д. При компиляции это всегда мой результат;

import android.support.annotation.NonNull;
                                 ^
/home/baw/snap/flutter/common/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_auth-0.6.2+1/android/src/main/java/io/flutter/plugins/firebaseauth/FirebaseAuthPlugin.java:538: error: cannot find symbol
    public void onComplete(@NonNull Task<AuthResult> task) {
                            ^
  symbol:   class NonNull
  location: class FirebaseAuthPlugin.SignInCompleteListener
/home/baw/snap/flutter/common/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_auth-0.6.2+1/android/src/main/java/io/flutter/plugins/firebaseauth/FirebaseAuthPlugin.java:558: error: cannot find symbol
    public void onComplete(@NonNull Task<Void> task) {
                            ^
  symbol:   class NonNull
  location: class FirebaseAuthPlugin.TaskVoidCompleteListener
/home/baw/snap/flutter/common/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_auth-0.6.2+1/android/src/main/java/io/flutter/plugins/firebaseauth/FirebaseAuthPlugin.java:576: error: cannot find symbol
    public void onComplete(@NonNull Task<ProviderQueryResult> task) {
                            ^
  symbol:   class NonNull
  location: class FirebaseAuthPlugin.ProvidersCompleteListener
/home/baw/snap/flutter/common/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_auth-0.6.2+1/android/src/main/java/io/flutter/plugins/firebaseauth/FirebaseAuthPlugin.java:175: error: cannot find symbol
                      public void onComplete(@NonNull Task<AuthResult> task) {
                                              ^
  symbol: class NonNull
/home/baw/snap/flutter/common/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_auth-0.6.2+1/android/src/main/java/io/flutter/plugins/firebaseauth/FirebaseAuthPlugin.java:270: error: cannot find symbol
          public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
                                          ^
  symbol: class NonNull
/home/baw/snap/flutter/common/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_auth-0.6.2+1/android/src/main/java/io/flutter/plugins/firebaseauth/FirebaseAuthPlugin.java:435: error: cannot find symbol
              public void onComplete(@NonNull Task<GetTokenResult> task) {
                                      ^
  symbol: class NonNull
/home/baw/snap/flutter/common/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_auth-0.6.2+1/android/src/main/java/io/flutter/plugins/firebaseauth/FirebaseAuthPlugin.java:487: error: cannot find symbol
          public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
                                          ^
  symbol: class NonNull
Note: /home/baw/snap/flutter/common/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_auth-0.6.2+1/android/src/main/java/io/flutter/plugins/firebaseauth/FirebaseAuthPlugin.java uses or overrides a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
8 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 2m 48s
The built failed likely due to AndroidX incompatibilities in a plugin. The tool is about to try using Jetfier to solve the incompatibility.
Building plugin cloud_firestore...
Running Gradle task 'assembleAarRelease'...
Exception: The plugin cloud_firestore could not be built due to the issue above.

Я пробовал различные исправления, касающиеся androidX, но мой проект уже перенесен и всегда был таковым, похоже, ничего не работает.

Вывод флаттер-доктора просто отличный

[✓] Flutter (Channel beta, 1.24.0-10.2.pre, on Linux, locale en_US.UTF-8)
[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.3)
[✓] Android Studio
[✓] Connected device (1 available)

• No issues found!```