The 6000 error series covers QuickBooks error 6138 105. In a multi-user setting, QuickBooks Desktop will display these 6000 series errors. Ensure that the company file is hosted only on the server computer before enabling multi-user mode. When one or more workstations host the corporate file rather than the server system, error code -6138-105 is triggered. When a machine other than the server takes ownership of the business file, other workstatio...