QuickBooks Error 6143 can be due to corrupted system files. It can be because of an incomplete or damaged installation. It can also be due to corrupted or deleted entries in the Windows Registry. As a part of QuickBooks Error 6143, you will see “Error 6143” appearing and crashing on your open Windows onscreen. So that is it. I have summed 3 reasons for it.Corrupt system files. Corrupt entries in the Windows registry. Damaged QuickBooks Enterprise installation.