Means you have corrupted data I think.
In your shell if in unix(or linux) type "perror 127"<RETURN> perror explains what type of error message it is.
That's all I know, I'm stuck on it as well. Just dumped 4.5million of data into a database and found the harddrive became full. The import must of crashed hence the bad data. I know, I've got a crappy 3gig old harddrive. I was experiementing.
Something to think about. Hope it helps.
DON'T USE MS load of £$%& Anyway it's just been proven that MySQL is just as good as Oracle. It's been said here. http://www.eweek.com/article/0,3658,s=708&a=23115,00.asp