Resolution is to replace the URL in the connection UI wtih a valid URL.
Resolution is to open the workbook on a computer that has Excel 2010 and the SQL Server 2012 PowerPivot for Excel add-in. Click the PowerPivot tab, and then click PowerPivot Window. If no data appears in the tabs of the PowerPivot Window, the workbook is not a PowerPivot workbook.
Resolution is to check your SharePoint permissions. You must have Contribute level of permission or above to use a PowerPivot workbook as a data source in another workbook or report.
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