This seems to be an odd error. Perhaps try running the recover using FM 10 Pro Advanced first, and after the file has been recovered then try to host it.
Hope this helps
If recovering the file fixes it, please replace the file with an undamaged back up copy if at all possible. There's no guarantee that a recovered file will work correctly.
"After wanting to turn on a 3rd..."
How are you "turning on" your files? Are these being hosted by Filemaker Server? If so, what version?
The more fully you can describe the issue, the better others can help you.