When I attempt to open my company file I get a response of company n. What can I do?

Visit this link for your reference

https://quickbooks.intuit.com/learn-support/en-us/open-programs/resolve-error-6000-when-opening-a-co...

Hope it helps.

Thank you for posting here on the Community page, @deb_benvenutti.

If you mean that there's no company file showing up under the Select a company that you've previously opened and click Open page, you have to click on the drop-down arrow beside Open a sample company file and select a file you want to open from there.

Also, you can try restoring a backup of the file you want to open.

Here's how:

1. In QuickBooks, go to the File menu and select Open or Restore Company.
2. Select Restore a backup copy and then Next.
3. Click on Local Backup and then Next.
4. Browse your computer for your backup company file. It should look like this: [Your company name].qbb.
5. Select a folder to decide where to save your restored company file. Then select Open.

You can also check out this article for additional reference about fixing missing QuickBooks Desktop company file: Company file is missing or cannot be found.

Keep me posted if you have any other questions. I'm a post away to help. Have a great day ahead!