QuickBooks Error 6000 83 usually occurs when QuickBooks cannot open, access, or restore a company file because of network, folder permission, or file-location problems. To fix the error, first close QuickBooks on all computers and reopen it using the administrator account. If the company file is stored on a network, verify that hosting is enabled only on the server. Move the company file to the local drive temporarily and try opening it again. You can also run QuickBooks Tool Hub and use the File Doctor to identify and repair company-file or network issues. Finally, check folder permissions and ensure QuickBooks is updated.