title: how can i solve that? [Fatal Error] kotlin-stdlib-jdk8-1.5.30.pom:2:1: Content is not allowed in prolog
body: <p>when i run the app</p>
  <p>.
  lib\main.dart:1
  [Fatal Error] kotlin-stdlib-jdk8-1.5.30.pom:2:1: Content is not allowed in prolog.</p>
  <p>FAILURE: Build failed with an exception.</p>
  <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 org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.5.30.
  Required by:
  project :app &gt; io.flutter:flutter_embedding_debug:1.0.0-e85ea0e79c6d894c120cda4ee8ee10fe6745e187 &gt; androidx.window:window-java:1.0.0-beta04 &gt; org.jetbrains.kotlinx:kotlinx-coroutines-core:1.5.2 &gt; org.jetbrains.kotlinx:kotlinx-coroutines-core-jvm:1.5.2
  project :app &gt; io.flutter:flutter_embedding_debug:1.0.0-e85ea0e79c6d894c120cda4ee8ee10fe6745e187 &gt; androidx.window:window-java:1.0.0-beta04 &gt; androidx.window:window:1.0.0-beta04 &gt; org.jetbrains.kotlinx:kotlinx-coroutines-android:1.5.2
  &gt; Could not resolve org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.5.30.
  &gt; Could not parse POM <a href="https://repo.maven.apache.org/maven2/org/jetbrains/kotlin/kotlin-stdlib-jdk8/1.5.30/kotlin-stdlib-jdk8-1.5.30.pom" rel="nofollow noreferrer">https://repo.maven.apache.org/maven2/org/jetbrains/kotlin/kotlin-stdlib-jdk8/1.5.30/kotlin-stdlib-jdk8-1.5.30.pom</a>
  &gt; Content is not allowed in prolog.</p>
  </blockquote>
  <ul>
  <li>Try:</li>
  </ul>
  <blockquote>
  <p>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>
  </blockquote>
  <ul>
  <li>Get more help at <a href="https://help.gradle.org" rel="nofollow noreferrer">https://help.gradle.org</a></li>
  </ul>
  <p>BUILD FAILED in 7m 8s
  Exception: Gradle task assembleDebug failed with exit code 1
  Exited (sigterm)</p>