title: WARNING: The option setting 'android.enableR8=true' is deprecated. (Flutter)
body: <p>if I run the command ./gradlew sync --stackstrace</p>
  <blockquote>
  <p>Configure project :firebase_auth WARNING: The option setting 'android.enableR8=true' is deprecated. It will be removed in version
  5.0 of the Android Gradle plugin. You will no longer be able to disable R8</p>
  <p>Deprecated Gradle features were used in this build, making it
  incompatible with Gradle 7.0. Use '--warning-mode all' to show the
  individual deprecation warnings. See
  <a href="https://docs.gradle.org/6.7/userguide/command_line_interface.html#sec:command_line_warnings" rel="nofollow noreferrer">https://docs.gradle.org/6.7/userguide/command_line_interface.html#sec:command_line_warnings</a></p>
  <p>BUILD SUCCESSFUL in 1s 8 actionable tasks: 8 up-to-date</p>
  </blockquote>
  <p>Problem is: in my Gradle.properties File is no <code>android.enableR8=true</code>. Here is my Gradle.properties file:</p>
  <blockquote>
  <p>org.gradle.jvmargs=-Xmx1536M</p>
  </blockquote>
  <blockquote>
  <p>android.useAndroidX=true</p>
  </blockquote>
  <blockquote>
  <p>android.enableJetifier=true</p>
  </blockquote>
  <blockquote>
  <p>org.gradle.java.home=/Applications/Android
  Studio.app/Contents/jre/jdk/Contents/Home/</p>
  </blockquote>
  <p>What can I do? I also runned this command with <code>--warning-mode all</code>, I got there the same Error, but this on top:</p>
  <blockquote>
  <ul>
  <li><p>What went wrong: Task 'sync' is ambiguous in root project 'android'. Candidates are: 'syncDebugLibJars', 'syncProfileLibJars',
  'syncReleaseLibJars'.</p>
  </li>
  <li><p>Try: Run gradlew tasks to get a list of available tasks. 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.</p>
  </li>
  <li><p>Get more help at <a href="https://help.gradle.org" rel="nofollow noreferrer">https://help.gradle.org</a></p>
  </li>
  </ul>
  </blockquote>
  <p>Thanks for your time,</p>
  <p>Boothosh</p>