It will repeat the process up to 6 times before it asks you what you want to do (continue or not.) Sometimes these types are of errors are due to some missing data durintg the downld process. But then, somtimes the file is corrupt at its source. I'd suggest to try to downld it again but from a diferent source.

Also see this: Corrupt files & T3 Spammers & make a note of size v's bit-rate.