since I\'ve updated to Android Studio 3.1, my project is not running anymore. I have searched for a solution all over the internet with no positive results. Here\'s the erro
I had the same issue and I solved it.Update all your com.google.android.gms:play-services dependencies to 15.0.0. It should look like this:
implementation 'com.google.android.gms:play-services-maps:15.0.0'
implementation 'com.google.android.gms:play-services-auth:15.0.0'
implementation 'com.google.android.gms:play-services-location:15.0.0'
implementation 'com.google.android.gms:play-services:15.0.0'
implementation 'com.google.android.gms:play-services-ads:15.0.0'
Once you do that, it should fix the issue with finding the NoClassDefFoundError error (at least it did for me).