title: Flutter Firebase Error (Execution failed for task ':app:mergeExtDexDebug')
body: <p>I'm new to programming, and I'm very new to flutter and firebase. I'm experimenting with this code (<a href="https://github.com/tattwei46/flutter_login_demo" rel="nofollow noreferrer">https://github.com/tattwei46/flutter_login_demo</a>), but I've run into an error. Everything should be the same except I changed the google-service.json and GoogleService.plist to match up with my firebase apps, and I edited home-page.dart. Here is what was printed out:</p>
  
  <p>AGPBI: {"kind":"error","text":"Type com.google.android.gms.common.internal.zzf is referenced as an interface from <code>com.google.android.gms.internal.zzcfb</code>.","sources":[{}],"tool":"D8"}</p>
  
  <p>FAILURE: Build failed with an exception.</p>
  
  <ul>
  <li><p>What went wrong:
  Execution failed for task ':app:mergeExtDexDebug'.</p>
  
  <blockquote>
    <p>Could not resolve all files for configuration ':app:debugRuntimeClasspath'.
    Failed to transform artifact 'firebase-analytics-impl.aar (com.google.firebase:firebase-analytics-impl:11.4.2)' to match attributes {artifactType=android-dex, dexing-enable-desugaring=true, dexing-is-debuggable=true, dexing-min-sdk=16}.
    Execution failed for DexingWithClasspathTransform: /Users/student/.gradle/caches/transforms-2/files-2.1/cfad2a10e4239993e5e793d023977752/jetified-firebase-analytics-impl-11.4.2/jars/classes.jar.
    Error while dexing.</p>
  </blockquote></li>
  <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 57s
  Finished with error: Gradle task assembleDebug failed with exit code 1</p>
  
  <p>Any solutions and/or ideas for what to look for? Flutter doctor reports no issues.</p>