I have searched for an answer to this with no results specific to my situation.
I have a user database that has not had this issue since it was created over a year ago. Suddenly, two users get this error on most of the records they try to enter, but nobody else has this problem. I can't replicate it as I don't get this when I try to update the same records.
I verified that the table the form is writing to matches all field types (number/text/date/etc), and of course it's not every record that has the issue.
Any suggestions?