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How do I resolve error 'EventCallbackLib: Error while fetching Item from Inventory. Please check logfile for details' in QuickBooks?

Overview

When trying to save an invoice you receive the following error "EventCallbackLib: Error while fetching Item from Inventory. Please check logfile for details". immediately followed by error “ATS -291: Object reference not set to an instance of an object"

Environment

QuickBooks Desktop

Resolution

  • If you are running AvaTax for QuickBooks version 85 replace DLL file to resolve. 
  • Contact Avalara Support for assistance.