Hi, I am not sure what the problem is and if I do anything wrong. I am unable to build and run this project in the latest flutter release. Thank you very much for your help.
$ flutter doctor
[✓] Flutter (on Linux, locale en_US.UTF-8, channel master)
• Flutter at /home/user/opt/flutter
• Framework revision 324ef1d1f6 (6 hours ago), 2017-12-05 19:17:58 -0800
• Engine revision b57fca02b5
• Tools Dart version 1.25.0-dev.11.0
• Engine Dart version 2.0.0-edge.d4cfecb1065d322d3670df7e9ec9a0cc2d4b90f0
[✓] Android toolchain - develop for Android devices (Android SDK 25.0.3)
• Android SDK at /home/user/Android/Sdk
• Android NDK location not configured (this optional configuration is useful for native profiling support)
• Platform android-25, build-tools 25.0.3
• ANDROID_HOME = /home/user/Android/Sdk
• Java binary at: /opt/android-studio/jre/bin/java
• Java version openjdk version "1.8.0_152-release"
[✓] Android Studio (version 3.0)
• Android Studio at /opt/android-studio
• Java version openjdk version "1.8.0_152-release"
[✓] Connected devices
• Redmi Note 3 • 7acabcd9 • android-arm • Android 7.1.1 (API 25)
$ flutter run --release
Initializing gradle... 1.1s
Resolving dependencies... 10.2s
Launching lib/main.dart on Redmi Note 3 in release mode...
Running 'gradlew assembleRelease'...
Picked up _JAVA_OPTIONS: -Dawt.useSystemAAFontSettings=on -Dswing.aatext=true
Note: /home/user/.pub-cache/hosted/pub.dartlang.org/firebase_database-0.0.14/android/src/main/java/io/flutter/plugins/firebase/database/FirebaseDatabasePlugin.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':app:transformClassesWithDexForRelease'.
> com.android.build.api.transform.TransformException: com.android.ide.common.process.ProcessException: java.util.concurrent.ExecutionException: com.android.dex.DexException: Multiple dex files define Lcom/google/android/gms/common/internal/zzaa;
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.
Gradle build failed: 1