QuickBooks company file stores all the financial data of a business and provides the user with an easy option to access all the business information at one single place. At times QuickBooks users face issues while opening or creating a new company file. 6000 series of errors in QuickBooks is related to the issues in the company file. One such error is QB error 6129, 0 that occurs while performing certain actions in the application like accessing the company file or trying to create a new company file. Error code -6129, 0 triggers error message “Error code: -6129, 0: Database connection verification failure” to display on users computer screen. Follow the complete article and learn how to remove error 6129, 0 from QuickBooks.