Hello, I have followed the tutorial at the below link to the letter which illustrates how to create a signed APK using Android Studio. I am even using the same version of Android Studio as used in the link (3.1.2). http://help.buildbox.com/exporting/creating-signed-apk-with-android-studio The error message I am getting when the APK build is attempted is as follows - Could not find play-services-ads.aar (com.google.android.gms: play-services-ads:12.0.1). Searched in the following locations: https://jcenter.bintray.com/com/google/android/gms/play-services-ads/12.0.1/play-services-ads-12.0.1.aar Does anybody know what this means and how to fix it? Thanks in advance for your time.