Hello, everyone. Jessie, a specialist in IT executive. 'QuickBooks Error 6190' is a common problem for most users. When you're using QuickBooks in multi-user mode and it's having trouble connecting to the company file on the network server, you'll get QuickBooks Desktop error 6190. When one or more multiple users execute QuickBooks Desktop in Multi-User Mode, intended to be enabled on the server machine, the error occurs. Make sure you're signed in as an administrator on your Windows PC before you start investigating the problem. If you don't have administrator privileges, right-click the QuickBooks Desktop icon. Then, choose Run as Administrator. QuickBooks File Doctor can help you recover files that have been damaged.