Sage 300 Error: Causes, Fixes, and Practical Ways to Avoid Them If there's a thing to ruin a great day, it's Sage 300 error popping up as you prepare reports in the process, invoices you need to send, or entries for the month closing. Sage 300 is powerful, without doubt, but just like any other software that manages databases, accounting and network communications, errors do happen. And when they do happen, they are often at the most embarrassing timings. ...