Okay, so I finnishd my world (sandy bay) and got it working in sims 3(base game only-no World Adventures). It works fine but when I re-started my computer the next day and then tryed loading it it says

'sims 3 has encounterd a fatel error while loading sandy bay.sims3, it is strognly recomended you re-start or terminate the aplication'

I can start a new world with sandy bay (clicking new game and selecting it). I then quit sims 3 and went back on and it still works (I can load the game), I then re-start my computer, run sims 3, click on sandy bay and it has the same message after about 3 seconds of loading. I click okay and go back to the main menu
(Note, all my other saves work (Riverview and Sunset Vally))

Plese help or post if you have the same problem!!!