The QuickBooks error 6000 77 belongs to the 6000 series of error codes. Users face this problem because they cannot access their company file or create backup files. The error occurs due to multiple factors, but its most common cause arises from damaged company files which get saved at incorrect locations. The QB company file error 6000 77 displays an error message on the screen to inform users about the problem. "We're sorry. QuickBooks en...