Sage 300 Error: Causes, Fixes, and Practical Ways to Avoid Them If there's one thing that can end a productive workday, it's a Sage 300 error popping up whenever you've got reports running, invoices to be sent, or monthly entries closing. Sage 300 is powerful, certain, but just like any other program that manages databases, accounting, and network communication the possibility of errors is there. And when they do, they can occur at the most difficult time. ...