i had the same problem and error message. - but i could solve it.
unfortunally, i cant remember completely, but i believe that the following advices should be useful.
1. go into PSN store
2. click on "show downloads"
3. now there is a list of all downloaded things.
4. choose your wipeout data and download it again.

how i said, i believe that this "technique" should help.
i dont know why but it seems there is a problem with the way u did.

at nothing bad happens if u do it like i said. gyou can give it a try