title: I have a problem when using Firebase with Flutter
body: <p>EDIT : I JUST REALIZED THAT IT HAPPENS EVEN WITH A SIMPLE SCREEN WITH AN APPBAR</p>
  <pre><code>[Fatal Error] firebase-firestore-22.1.2.pom:2:1: Content is not allowed in prolog.
  [Fatal Error] firebase-firestore-22.1.2.pom:2:1: Content is not allowed in prolog.
  [Fatal Error] firebase-firestore-22.1.2.pom:2:1: Content is not allowed in prolog.
  [Fatal Error] firebase-firestore-22.1.2.pom:2:1: Content is not allowed in prolog.
  [Fatal Error] firebase-firestore-22.1.2.pom:2:1: Content is not allowed in prolog.
  
  FAILURE: Build failed with an exception.
  </code></pre>
  <ul>
  <li>What went wrong:
  Execution failed for task ':app:checkDebugAarMetadata'.</li>
  </ul>
  <blockquote>
  <p>Could not resolve all files for configuration ':app:debugRuntimeClasspath'.
  Could not resolve com.google.firebase:firebase-firestore:22.1.2.
  Required by:
  project :app &gt; com.google.firebase:firebase-bom:27.0.0
  &gt; Could not resolve com.google.firebase:firebase-firestore:22.1.2.
  &gt; Could not parse POM <a href="https://dl.google.com/dl/android/maven2/com/google/firebase/firebase-firestore/22.1.2/firebase-firestore-22.1.2.pom" rel="nofollow noreferrer">https://dl.google.com/dl/android/maven2/com/google/firebase/firebase-firestore/22.1.2/firebase-firestore-22.1.2.pom</a>
  &gt; Content is not allowed in prolog.</p>
  </blockquote>
  <blockquote>
  <p>Could not resolve com.google.firebase:firebase-firestore:22.1.2.
  Required by:
  project :app &gt; project :cloud_firestore
  &gt; Could not resolve com.google.firebase:firebase-firestore:22.1.2.
  &gt; Could not parse POM <a href="https://dl.google.com/dl/android/maven2/com/google/firebase/firebase-firestore/22.1.2/firebase-firestore-22.1.2.pom" rel="nofollow noreferrer">https://dl.google.com/dl/android/maven2/com/google/firebase/firebase-firestore/22.1.2/firebase-firestore-22.1.2.pom</a>
  &gt; Content is not allowed in prolog.
  Content is not allowed in prolog.</p>
  </blockquote>
  <ul>
  <li><p>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.</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>
  <p>BUILD FAILED in 1m 19s
  Exception: Gradle task assembleDebug failed with exit code 1</p>
  <p>//&gt; Could not resolve all files for configuration ':app:debugRuntimeClasspath'.</p>
  <blockquote>
  <p>Could not resolve com.google.firebase:firebase-firestore:22.1.2. (REPETEAD MANY TIMES  )</p>
  </blockquote>
  <p>//&gt; Could not resolve com.google.firebase:firebase-firestore:22.1.2.
  &gt; Could not parse POM <a href="https://dl.google.com/dl/android/maven2/com/google/firebase/firebase-firestore/22.1.2/firebase-firestore-22.1.2.pom" rel="nofollow noreferrer">https://dl.google.com/dl/android/maven2/com/google/firebase/firebase-firestore/22.1.2/firebase-firestore-22.1.2.pom</a> (REPETEAD MANY TIMES  )</p>