QuickBooks Error 6000 77 You might run into QuickBooks error 6000 77 when accessing the company file. A plethora of reasons can be responsible for the occurrence of this issue. For instance, incorrect folder permissions, storing the company file on an external device rather than on a local device. Moreover, it may occur if QB is running in multi-user mode. You won’t be able to back up your company file, and the program crashes or freezes while trying to access the file. If y