QuickBooks Error PS107 occurs when there is an issue initializing the QuickBooks Payroll service. This error typically arises due to corrupted data files, outdated payroll updates, or issues with internet connectivity during the update process. To resolve Error PS107, users should ensure they are using the latest version of QuickBooks, verify their payroll subscription, and check internet connectivity. Reinstalling the payroll update and repairing the QuickBooks installation may also help in fixing the error. For a detailed guide on resolving Error PS107, visit QuickBooks Error PS107 Guide.