I have encountered several QB errors and I understand how complicated it can get to resolve each of them. This is the best way to fix QuickBooks Error 6147 in my
experience -
Move to the folder where your company file is stored.
Search for the file with the .QBW extension. This is your company file.
Right-click over it and choose to Rename.
Check if the name of the company file including the .QBE extension is exceeding 64 characters. Ensure that there are no special characters and extra spaces. At last,
add .OLD to the name of the file.
Finally, access QuickBooks and your company file to check if the issue has been resolved.
You can give a shot to having a conversation with the certified professionals available at 1-855-856-0042 to fix QuickBooks Error 6147.