Sage 300 Error: Causes, Fixes, and Practical Ways to Avoid Them If there's a thing that can ruin a working day, it's a Sage 300 error popping up at the time you have reports to run, invoices due to send, or month-end entries to finish. Sage 300 is powerful, certainly, but as with all programs that handles accounting, databases as well as network communication there are errors that can occur. And, when they do, they usually occur at unsettling moments. ...