QuickBooks Error 6129 occurs when the software can't access the company file. It might be due to network issues, file corruption, or improper folder permissions. To fix it, ensure QuickBooks is updated, and then try renaming the .ND and .TLG files associated with the company file. You can also create a new folder and move the company file into it. Additionally, check firewall and antivirus settings to ensure QuickBooks is allowed access.
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