How to solve the error "execution failed for task ':app:transformdexarchivewithexternallibsdexmergerfor"debug'?

Question

Hi everyone. When running builds in Android Studio, the following build errors"execution failed for task ':app:transformdexarchivewithexternallibsdexmergerfordebug'" were encountered:

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

The file of my app:build.gradle :

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'

I have reseached many information sources, but I cound find the solution to fix this error. If you know the answer, please help me. Thanks a lot.

lyytutoria · Answer

The cause:

When you add an external library that might not be compatible with your compileSdkVersion, this error occurs:

When including an external library, you should take care of it.

The solution:

I took few days to study this problem, and you can do this way:

Ensure that all of your reference libraries compileSdkVersion of your build.gradle(Module:app) . For example it is 26 of mine.

enter image description here

In the defaultConfig category type multiDexEnabled true. This part had to do.

multiDexEnabled True image

Click okay after trying to enable or disable Instant Run to hot swap in File | Settings | Build, Execution, Deployment | Instant Run.

Enable Instant Run to Hot swap... Image

Your project in Sync
Finally, select Rebuild Project by going to Build.

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How to solve the error “execution failed for task ‘:app:transformdexarchivewithexternallibsdexmergerfor”debug’?