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Avalara Help Center

How do I resolve 'ATS-291: a QuickBooks company data file is already open'?


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
    • Or upgrade to our latest connector found in the Admin Console, under Home > Get Started.