<p>Quickbooks Error 6000 is the most common error in QuickBooks. It usually appears when you open your company file. You may encounter the following errors:</p><p>Error -6000, -80 in Quickbooks<br />One of the following reasons may be causing this error:<br />Over a network, data is converted.<br />Your file has been damaged.<br />QuickBooks cannot communicate with the server.<br />The data file is hosted on more than one computer.</p>