QuickBooks Error 9999 is the error code that is generated when one of the following errors occurs:
The first cause of QuickBooks Error 9999 is a problem with the connection between your computer and your QuickBooks software.
QuickBooks Error 9999: The data file is corrupted.
QuickBooks Error 9999: The data file has been damaged.
QuickBooks Error 9999: There are too many records in the file.
QuickBooks Error 9999: There are too few records in the file.
QuickBooks Error 9999: The data file is being used by another program.