ok, first off you cannot use data from another profile.
The other thing is without the exact error message there is no way to know exactly what needs to be done.
kinda like saying " my car won't run, what can I do to fix it".
Here are some things you might try tho, and you will need a flashdrive to do it.
1) quit the game
2) go to saved data utility(PS3)
3) find your game save file (this should be pretty easy to do)
4) click the "triangle button"
5) click on copy
6) choose your flashdrive as the destination
7) copy your saved game file to the flashdrive AND copy it to a file on your PC/Laptop (this is a major thing to do as an additional backup to the PS3(do this at least once a week (daily is better) and then you will always have a copy to fall back on)
Now comes the fun part
8) delete your game save off the PS3
9) delete the game install off the PS3
10) reinstall the game on the console
11) copy your saved game off the flashdrive back to the console
One other thing, the game saves you see in the data utility will apply only to the profile you are logged in to.
Hopefully this will help you
I have 11 accts on my console and this is something I do every day, and I have a flash drive for every acct.