Check to see if the scan file is going to the errorscan folder on the server.
If it is, look at the event log on the core server and see if you see a message for that time. It may tell you why it was flagged as an errorscan.
Thanks! That did the trick. After looking in Event Viewer, I saw one of the columns in the database needed to be increased. I did that, and the next Inventory Scan was processed successfully.