You are playing a non-final, unauthorized copy of The Sims 3.
Purchasing and registering an official copy of The Sims 3 will entitle you to benefits including access to an entirely new game town called River view, 1000 Sim Points which can be redeemed for game objects in The Sims 3 Store, and access to The Sims 3 Exchange.
This message comes when you’re playing it connected to the Internet. I was advised to disconnect the computer from Internet while playing The Sims 3. That way the .exe file of game cannot communicate with EA.