Hello there, Lynn918.

I appreciate you doing the steps given by my peer above. If you're still getting an error, I recommend you reach one of our experts.

Here's how:

1. Go to Help in the upper right corner of QBO.
2. Look for Talk to a human and click on it. 
3. Type in "support" or "contact support" again and press Enter.
4. Click I still need a human.
5. Select Get help from a human.
6. Choose between Chat with us or Have us call you. 

You can check some information about creating invoices here. 

Get back to me if you have any more questions. I'm a post away.