Mac Contacts stopped syncing with Google - error message

A few days ago my GMail contacts stopped syncing with Mac OS

Contacts app.  All my contact groups disappeared.  Now there is an error

message appearing on the Mac Contacts app, see attached picture. 

Syncing has stopped.  I have not changed my Gmail password, nor updated

my Mac OS.  I normally use Mac's Mail app to handle all my email on the

desktop, not a browser.  See attached picture for error message. 

Mac OS Sierra V 10.12.2,  Contacts app is V 10.0.