According to Intuit, Error Code -6190, -83: “QuickBooks was unable to open the company file” is an error that can occur when running QuickBooks in multiuser mode on Windows Server. It’s caused because multiple workstations are configured to host the company file (incorrect) instead of all workstations having a Hosting setting of off and a server configured with a Hosting setting of local files only or local and remote files (correct).
Intuit offers a troubleshooting guide to address this issue that’s linked below. This guide will discuss checking the Hosting setting on the server and each workstation. You can confirm the Hosting setting by pressing F2 while QuickBooks is running. Doing so will display the Product Information window. The Hosting setting appears in the lower left corner.
To follow the troubleshooting steps to resolve Error Code -6190, -83, consult this Intuit knowledge base article.