What causes QuickBooks Desktop Error – 6123, 0? When the user updates or upgrades QuickBooks company file after updating/ upgrading QuickBooks Software then the user may face error 6123, 0. Following are the situations when the Error is most likely generated. • Restoring Company file present in network drive or External drive • Intermittent network connection while updation/ upgradation of company file • QuickBooks Company file to be restored is damaged • Malware or malicious software affecting Upgrade process of company file • Firewall settings interrupting QuickBooks wile opening Company file • Windows system files are
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