Exactly what is the error message? You can't actually "edit" a report, but if you have a report in design mode and someone else is using it, you may not be able to save the changes you make. It's best to make design changes when no one else is using the database if possible. If you are in design mode and have changed the name of one of your textboxes or comboboxes, you may be referring to the field incorrectly.