I get this error too - code number 1863851@mc01
I can definitely rule out connection problems.
Same problem here!
My iPhone6 is up to date, the game itself it up to date and I have a very strong internet connection.
The error message states:
Out of sync with server.
Game will restart.
Progress may be lost.
If issue persists please contact Customer Support.
I worry about the "progress will be lost" part, as I was playing the app since it launched and almost fully completed two whole floors. I also spent about 40 euros on in app purchases (shouldn't have, apparently) and have collected 22.000 shillings.
Besides the fact that I can no longer play the game at all, the game was quitting all the time.