It sounds as if a file is damaged but one that is not
very important - one that can be safely replaced.
You can do these steps even if other users are running
Open Shop-Pro and from the Main Menu choose File,
Miscellaneous Options, Dot-Prompt and then press Enter to
get the blank (usually blue) screen. At the dot-prompt type:
!..\PKUNZIP -o ..\DBF INVAREAS.DBF .\ and press Enter
You may see the screen blink but you should not see any particular
Escape out of the dot-prompt area back to the Shop-Pro Main Menu
and verify if the cleanup runs successfully.
(note that -o is a dash and a small letter O - not a zero
note that above there are back-slashes - not forward slashes
note that above there are instances of two periods and also one period)