QuickBooks Error 9000 typically occurs when QuickBooks accounting software is unable to access the company file while processing payroll, either because the file is damaged or corrupt. This can happen for a variety of reasons, including power outages, hardware malfunctions, viruses, or software bugs. The company file can also be inaccessible because it is stored on an external device or network drive that is not connected properly or there is some problem with network configuration. This error can be frustrating and disruptive to business operations, but there are several steps that users can take to troubleshoot and resolve it in time. This article is precisely about how to resolve error code 9000 in QuickBooks desktop.