Maven artifact not found com.google.firebase/

I am upgrading a number of apps to incorporate Firebase.

When I click on a library to include it in my B4A project i receive the following error message in a popup window:

"Maven artifact not found. com.google.firebase/firebase-crash"
and also:
"Maven artifact not found. com.google.firebase/firebase-ads"

This message appears irrespective of the library I select - ie it occurs with Firebase and non Firebase libraries.

To try to stop this popup appearing I have:

1] reloaded B4A v6;

2]...

Maven artifact not found com.google.firebase/

from B4X Community - Android, iOS, desktop, server and IoT programming tools http://ift.tt/29A02YV
via IFTTT