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:transformDexArchiveWithExternalLi

Answer 1

Also be sure your app is subclassing MultiDexApplication

import android.support.multidex.MultiDexApplication

class App : MultiDexApplication()

or if not subclassing Application class, add to AndroidManifest.xml