To fix QuickBooks error 6000 you must scan the company files.
Ø On your windows screen, hit the start button and go to programs.
Ø Under programs select QuickBooks and under this, choose database server manager.
Ø On the server manager window, tap on add folder and after that start the scan.
Ø Go through the files and make sure that files ending with .qbw.nd have been generated.
If you the assistance of an expert, call Quickbooks Customer Support to acquire personalized assistance.
For More Information click on this links:-
Quickbooks Support Phone Number
