Causes of QuickBooks Error 80029c4a QuickBooks desktop files that are damaged, missing, or corrupted. A user encounters this error when their software is unable to locate or corrupted company files. By mistake, your antivirus software detected several Trojans or malicious files in QB Desktop files. There is a problem with the Windows registry. https://opencloudmanifesto.org/quickbooks-error-80029c4a/,