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How to resolve Unhandled Exception errors after installing AvaTax for Sage 50


After installing version of the AvaTax for Sage 50 connector, you are seeing the following error message:

""Unable to load DLL w3btrv7.dll": The specified produce could not be found. Expection from HRESULT: 0x8007007F"


AvaTax for Sage 50


  • Navigate to the following directory: C:\Program Files(x86)\Avalara\AvaTax for Sage 50 

    • Rename the file w3btrv7.dll to w3btrv7x.dll.