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

Same thing happened to me, figured out that I was in the middle of updating to AS 3.0.1 and after I did the update, cleaned and rebuilt the app, everything was fixed.