How do I prepare a letter with envelop for my customers using the Company dropdown menu? The error msg says my letter has no letter fields. What am I doing wrong?

I'll help you get rid of this error, csrodenburgh.

I've come across some related cases about the error message you're getting and it seems this has something to do with the QuickBooks 2020 program.

Generally, when we run into trouble upon using letters, we can use the QuickBooks Tool Hub to resolve the errors. Before diving in, we need to download the tool first. Just a few simple steps and your ready to go in no time.

Here's how to download and use the tool:

1. Close QuickBooks.
2. Download the QuickBooks Tool Hub file. 
3. Open the file you downloaded (QuickBooksToolHub.exe).
4. Follow the on-screen steps to install and agree to the terms and conditions.
5. When the install finishes, double-click the icon on your Windows desktop to open the tool hub.
6. In the tool hub, select Installation Issues.
7. Select QuickBooks Install Diagnostic Tool. 
8. When the tool finishes, restart your computer.

If you still encounter the error after performing the steps above, I'd recommend repairing your QuickBooks Desktop so that you can get back to your business.

I've also included an article that will help in preparing collection letters for overdue customers: Customizing forms and writing QuickBooks Letters.

Let me know how it goes in the comment section, as I want to ensure that you can successfully prepare and use your letters.