Invalid Or Non Existent Document

When a user opens up Lotus Notes and gets invalid or non-existent document,
keep clicking OK until the error message goes away.(It may take anywhere from 2
to 20 clicks) Once inside notes refresh the their personal address book, and
the next time they go to open up Notes the error message will be gone. It has
to do with the location document, that resides inside of the personal address
book, getting corrupted.