QuickBooks Error 6129 0 is an authentication failure in the software. It pops up when database connection verification fails or when the user tries...
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error codes -6129, 0
Create a back up your company file beforehand to avoid any accidental data loss.
Reboot the computer and tap the Windows Start menu.
Find Control Panel on the search field or select it from the list.
Press Programs and Features then Uninstall a Program.
Regards,
Willjoe