OLSU errors have always been tricky; no matter how professional or technical you are, you might be confused by these errors in a matter of seconds. If you're stuck with QuickBooks Error Code OLSU 1013 and don't know what to do, we're here to help. Simply go through this section, where we will cover the basics of the OLSU 1013 error. When it comes to the QuickBooks OLSU error 1013, it usually occurs when the QuickBooks software is not properly connected to the bank.