Resolution:
You should identify the cause of the error. It might be something obvious such as a crash. You can run Rebuild using the /f option to find more about the nature of the corruption.
You should rerun your program using the backup copy of that file. If you have added a great deal of information to the file since you last took a backup you might like to rebuild the file using the Rebuild utility, which reads the data (if this has not been corrupted) and builds a new index for it.