Problem Installing late Night

[artiston]

Hi... when I install Late Night, it shows this error:
The Sims 3 needs to be updated before this product can be installed.
Setup will now attempt to update The Sims 3. Do you wish to continue?
When I select yes, it shows me: update in progress, please wait.
Then it shows: update of the Sims 3 failed, setup in unable to continue.

Please help me.

[Pam]

It's a good idea to do an uninstall and reinstall of the game when you add an expansion pack.  When you do this, the game will update as needed.  If you decide to try this, be sure to check our Technical Help board for some topics that will help you have a successful reinstall.