San Myshuno disspeared from my game

EA_Solaire​ So I have had city living for long time now and have many of my sims living there. so I know its downloaded. I am wondering however if its a corruption in a build that I downloaded from the gallery, it has been there for a while now and I didn't get around to playing on that lot unstill now, I started to play on the lot with the build and it was lagging badly (it was a rental,) so I decided to edit the lot and take some things out, I couldn't load back to the mange world so I closed the game down, when I tried to get back in however I can see San Myshuno on the Worlds map but when I click into it, its just white page and then I can not  click anything I have to close down. This happened to my lot on willow creek on movers and shakers lot that now has error 800 when I try to click into it or edit it, I even tried to build a lot on it with nothing on, from the map, but it just gives error and I can not do anything after that and have to close the game down. Also some of my dinners have stopped working. no hosts or staff even if I buy a lot and try to employ staff I can not open the restaurant. So I fear my saved game is now corrupted! I am kind of sad that I am going to have make new game and move all my sims over as I have saved them in my library cos I know they will lose there family gens but I fear this is the only thing I can do,  When I made a new world as a test all is working there. I just wish that there was a way these builds that people put in the gallery was tested before allowing people to download them because there is no way of knowing if a build is corrupted.