Hi valerie,

I'll help you get past this error message and have your QuickBooks Desktop up and running. 

You'll get error codes -6190 and -816 when another user is logged in to the company file in a single user mode. There are several solutions we can try to resolve this. 

Let's first make sure that your QuickBooks release is up-to-date. Then, rename the ND and TLG files to repair the company damaged data files.

Here's how:

1. Open the folder that contains your company file.
2. Find the files with the same file name as your company files but with extensions.ND and.TLG.
   • company_file.qbw.nd
   • company_file.qbw.tlg
3. Right-click each file and select Rename. Add the word OLD at the end of each file name. Ex: company_file.qbw.nd.OLD
4. Open QuickBooks again and try to sign in to your company file. If the same issue occurs, proceed to solution 2.

You can also check out this article for more troubleshooting steps about the error -6000: Resolve Error -6000, when opening a company file. 

I'd also suggest giving us a call so one of our Technical Support specialists can guide you through the process. Here's how to get in touch with our QuickBooks Desktop Customer Care:

1. Go to https://help.quickbooks.intuit.com/en_US/contact
2. Select QuickBooks for Windows.
3. Select your QuickBooks for Windows version.
4. Select a topic.
5. Click on the Get Phone Number button.

You can always visit us anytime soon if you have any questions.We're here to help however we can.