After migrating from Android Studio 3.0 (Canary 5) to Android Studio 3.0 (Beta 1), and moving to latest gradle , i.e. \'com.android.tools.build:gradle:3.0.0-beta1\'
\'com.android.tools.build:gradle:3.0.0-beta1\'
my problem was network connection. I needed to connect to a vpn server to connect to jcenter