In addition to not being able to view the company file, there are many other things that can cause QuickBooks to show
QB error 6143.
Files are taken out of Windows or deleted.
The Windows system files are wrong.
Malware or getting a bug.
Application and tools that were not set up or downloaded correctly.
Some Windows system files are broken or lost.
When launching or downloading QB software, something went wrong.
The program is preventing the company file from being opened.
You must immediately rectify these causes to get rid of QuickBooks error 6143 from your system.