I get 6123 on my company files. I tried a new computer, tried a fresh write of os, QuickBooks 2019. I have qb2019 windows 10 1903. I tried renaming nd and files The problem is that sometimes the company opens up and sometimes this error. tried 3 different computers. it seems to work the best on a win 7 machine that's upgraded to win 10.(it opens 7 out of 10 times. I ran diagnostic tool, file doctor and tool hub. I am going back to 1809 to see if any changes. It maybe the company file, but I set up a new computer last week also and it does the same thing. I am out of ideas. Cant you point me to another direction?