QuickBooks desktop error 6000 77 is commonly caused by issues related to the company file or folder permissions. Some possible causes include:
Damaged company file: If the company file is corrupted or damaged, QuickBooks may encounter Error 6000 77 while trying to access it.
Incorrect folder permissions: Insufficient or incorrect folder permissions can prevent QuickBooks from accessing or opening the company file.
Network issues: Problems with the network connection, such as interruptions or slow connectivity, can lead to this error when attempting to access the company file over the network.
QuickBooks installation problems: If QuickBooks is not installed correctly or some components are missing or damaged, it can result in QuickBooks desktop error 6000 77.