The QuickBooks error message "QBCFMonitorService Not Running On This Computer" indicates that the QuickBooks Company File Monitor Service is not operational. Restarting the service or performing troubleshooting is necessary to fix this issue, which hinders multi-user functioning and restores file monitoring and sharing to normal. If you require quick help and guidance, don't hesitate to contact the QuickBooks Support Team directly at 1.855.738.2784.