Task :app:transformDexArchiveWithDexMergerForDebug FAILED In React Native
By React Native Debugger
If your methods + your dependencies method greater then 64k+ methods then your react native throwing DexMerger error.
Follow some simple steps you absolutely solved this error.

Step 1: Enable MultiDex
Dir - Project/Android/app/build.gradleandroid {
defaultConfig {
...
minSdkVersion 15
targetSdkVersion 28
multiDexEnabled true // add this line
}
...
}
Step 2: Add Multidex dependencies
Dir - Project/Android/app/build.gradledependencies {
...
def multidex_version = "2.0.1"
implementation 'androidx.multidex:multidex:$multidex_version'
}
Step 3: Change Your Extends Application
Dir - Project/android/app/src/main/java/com/Project/MainApplicationpublic class MainApplication extends MultiDexApplication implements ReactApplication {
Step 4: Run Your Project
Project> cd android
Project> gradlew clean
Project> cd ..
Project> npx react-native run-android
Please clap for your solved error…