Error attempting to refresh workbook containing PowerPivot data model

Nov 22, 2013 at 4:55 PM
I've attempted refreshing a xlsx workbooks containing PowerPivot data models in both Excel2010 and Excel2013 using the following command line:
C:\Program Files (x86)\Excel Refresher Service>RefreshExcel "C:\Users\useraccount\Documents\WorkbookName.xlsx"

Each time I run this command, I get the error message:
Error: Error Connecting to PowerPivot in 'WorkbookName.xlsx' : Exception from HRESULT: 0x800A03EC

I can update the PowerPivot model in these workbooks directly from Excel2010 and Excel2013 so I know the registry settings are correct. Also, I have confirmed that the user attempting the refresh is a domain account granted "log in as a service" permission.

Any ideas on what is not allowing PowerPivot refreshes?