You are trying to create an invoice but receive:
"Error had occurred [ATS-291]:
A QuickBooks company data file is already open and it is different from the one requested or there are multiple company files open".
- This is a known issue with Avalara connector version 81.
- To resolve this issue, a new DLL file will need to be installed. Please contact Avalara support (877) 780-4848 or email@example.com