Sage 300 Error: Causes, Fixes, and Practical Ways to Avoid Them If there's anything that can ruin an otherwise working day, it's a Sage 300 error popping up just when you've got reports running, invoices to be sent, or monthly entries closing. Sage 300 is powerful, sure, but as with any program that handles accounting, databases and network communications errors can happen. And, when they do, they usually occur at inconvenient timings. ...