Flutter: Build failed with an exception - firebase

Question

I am trying to use FirebaseAuth in a flutter application. I can use Firestore service but when i include firebase_auth depedency in pubspec.yaml file i got the following exception.
FAILURE: Build failed with an exception.
* What went wrong:Execution failed for task ':app:transformDexArchiveWithExternalLibsDexMergerForDebug'.
> java.lang.RuntimeException: java.lang.RuntimeException: com.android.builder.dexing.DexArchiveMergerException: Unable to merge dex
* Try:Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get
more log output.
* Get more help at https://help.gradle.org
here is my pubspec.yaml file
dependencies:
flutter:
sdk: flutter
intl: ^0.15.6
#firebase_core: ^0.2.2
google_sign_in:
git:
url: http://github.com/jahirhstu/flutter_plugins.git
path: packages/google_sign_in
#firebase_analytics:
# git:
# url: http://github.com/jahirhstu/flutter_plugins.git
# path: packages/firebase_analytics
firebase_auth:
git:
url: http://github.com/jahirhstu/flutter_plugins.git
path: packages/firebase_auth
cloud_firestore:
git:
url: http://github.com/jahirhstu/flutter_plugins.git
path: packages/cloud_firestore
cupertino_icons: ^0.1.0
shrine_images: 1.0.0
dev_dependencies:
flutter_test:
sdk: flutter

Answer 1

Well, I was trying to solve it and what I did was:
*1.-Reinstall Flutter
2.-Reinstall Dart SDK
3.-Download Gradle 5.1.1
4.-Create a new Application with Firebase and include dependencies
5.-Compile again*
And all of these didnt work.
Then I did:
6.-Copy next lines at the end of gradle.properties
android.useAndroidX=true
android.enableJetifier=true
7.-Changes on file app\build.gradle
android {
compileSdkVersion 28
...
defaultConfig {
minSdkVersion 21
targetSdkVersion 28
multiDexEnabled true
...
}
}
8.-Optionally you can add code inside subproject{} in file android\build.gradle
subprojects {
...
gradle.projectsEvaluated {
tasks.withType(JavaCompile) {
options.compilerArgs << "-Xlint:deprecation" << "-Xlint:unchecked"
}
}
}
9.-Go to terminal and launch command
flutter clean
10.-Run your app.
Hope will be helpful

Answer 2

In your Project folder > android > app > build.gradle:
add the following Line in defaultConfig { .... multiDexEnabled true }

Answer 3

try doing this in the /android/app/build.gradle file:
android {
defaultConfig {
// ...
minSdkVersion 16
targetSdkVersion 28
multiDexEnabled true
}
}
dependencies {
implementation 'com.android.support:multidex:1.0.3'
}

Answer 4

If none of the above technique works simply downgrade your gradle build level. This will solve your problem.
dependencies {
`classpath` '`com.android.tools.build:gradle:**3.5.0**`'
}