Hello, I have and mac and while playing sims 3 I keep on getting a error message to debug yes or no? And it keep crashing please help what to do?

Unfortunately, this means it's mostly likely due to Cider problems and there's no real "solution" for it.  I'm not sure how much troubleshooting you've already tried, but here's some advice:

If you actually want to "play" the game as it's supposed to work, then get a PC or Bootcamp & Windows for your Mac. The game is not natively written for our systems (I have a mid-2009 Macbook Pro). As long as EA uses Cider, a "wrapper" for the game that enables Macs to play Windows games, it's going to crash with memory issues.

Do not follow EA game advisors' advice without taking into account that many times their advice is wrong for Mac users and can harm our systems. If EA's customer support tells you to open Activity Monitor and quit processes - DO NOT DO IT. Your Mac will freeze resulting in you needing to power it off using the Power button which can be harmful. This is the first "solution" they tell all Mac users to do. Just use common sense when it comes to their "advice."

Here are two good posts from the Sims 3 Mac forum that have a couple of useful "band-aids" to get the game to work temporarily.  It won't stop the crashing but it can get you a little more time to play before it crashes:
-- http://forum.thesims3.com/jforum/posts/list/658546.page
-- http://forum.thesims3.com/jforum/posts/list/611723.page

Best of luck in your battle to play the Sims 3.