Android Studio 3.0 Execution failed for task: unable to merge dex

Question

android studio was getting build error while build execution with following:

Error:Execution failed for task ':app:transformDexArchiveWithExternalLibsDexMergerForDebug'. java.lang.RuntimeException: java.lang.RuntimeException: com.android.builder.dexing.DexArchiveMergerException: Unable to merge dex"

My app:build.gradle file:

apply plugin: 'com.android.application'  android {     compileSdkVersion 26     buildToolsVersion '26.0.2'     defaultConfig {         applicationId "com.pdroid.foodieschoice"         minSdkVersion 16         targetSdkVersion 25         versionCode 1         versionName "1.0"         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"     }     buildTypes {         release {             minifyEnabled false             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'         }     } }  dependencies {     compile fileTree(dir: 'libs', include: ['*.jar'])     androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {         exclude group: 'com.android.support', module: 'support-annotations'     })     compile 'com.android.support.constraint:constraint-layout:1.0.2'     compile 'com.firebaseui:firebase-ui-auth:2.3.0'      testCompile 'junit:junit:4.12' } configurations.all {     resolutionStrategy {         force 'com.android.support:appcompat-v7:26.0.1'         force 'com.android.support:support-compat:26.0.1'         force 'com.android.support:support-core-ui:26.0.1'         force 'com.android.support:support-annotations:26.0.1'         force 'com.android.support:recyclerview-v7:26.0.1'     } }  apply plugin: 'com.google.gms.google-services' 

any solutions

Edit: i have done with sample through firebase github site and solved

Answer 1

For Cordova based project, run cordova clean android before build again, as @mkimmet suggested.