Fixed this.
Here is how for anyone with same problem.
( previous
multi player game crashed with "unexpected error - close window etc.." ,
every attempt to get back into game screen , different browsers etc ...
same "unexpected error...close window".. tried getting invited... same
thing.
When the game screen opens it looks like its trying to
re-connect me to a game that no longer exists , then gives me the
"unexpected error.. close window.. try later"
THIS IS WHAT WORKED TO FIX IT FOR ME
when
the game screen opens , click on the menu at the top left of the screen
BEFORE the browser has chance to jump to its default error message.
I'm
not actually sure if it was the small menu or large "MAIN MENU" which
comes up since I was clicking on both, but whichever it was , it cleared
the bad loop to the error screen & took me to the menu.
Hope this helps