Powerview connection error
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When I try to create a powerview report from an excel spreadsheet in Sharepoint, I get the following error message.

Please help

An error occurred while loading the model for the item or data source 'http://win-lnj1eq8qsfv:16350/PowerPivotTestSite/PowerPivot Gallery/Sum of Sales Quota.xlsx'. Verify that the connection information is correct and that you have permissions to access the data source.


<detail><ErrorCode xmlns="http://www.microsoft.com/sql/reportingservices">rsCannotRetrieveModel</ErrorCode><HttpStatus xmlns="http://www.microsoft.com/sql/reportingservices">400</HttpStatus><Message xmlns="http://www.microsoft.com/sql/reportingservices">An error occurred while loading the model for the item or data source 'http://win-lnj1eq8qsfv:16350/PowerPivotTestSite/PowerPivot Gallery/Sum of Sales Quota.xlsx'. Verify that the connection information is correct and that you have permissions to access the data source.</Message><HelpLink xmlns="http://www.microsoft.com/sql/reportingservices">http://go.microsoft.com/fwlink/?LinkId=20476&amp;EvtSrc=Microsoft.ReportingServices.Diagnostics.Utilities.ErrorStrings&amp;EvtID=rsCannotRetrieveModel&amp;ProdName=Microsoft%20SQL%20Server%20Reporting%20Services&amp;ProdVer=11.0.2100.60</HelpLink><ProductName xmlns="http://www.microsoft.com/sql/reportingservices">Microsoft SQL Server Reporting Services</ProductName><ProductVersion xmlns="http://www.microsoft.com/sql/reportingservices">11.0.2100.60</ProductVersion><ProductLocaleId xmlns="http://www.microsoft.com/sql/reportingservices">127</ProductLocaleId><OperatingSystem xmlns="http://www.microsoft.com/sql/reportingservices">OsIndependent</OperatingSystem><CountryLocaleId xmlns="http://www.microsoft.com/sql/reportingservices">1033</CountryLocaleId><MoreInformation xmlns="http://www.microsoft.com/sql/reportingservices"><Source>ReportingServicesLibrary</Source><Message msrs:ErrorCode="rsCannotRetrieveModel" msrs:HelpLink="http://go.microsoft.com/fwlink/?LinkId=20476&amp;EvtSrc=Microsoft.ReportingServices.Diagnostics.Utilities.ErrorStrings&amp;EvtID=rsCannotRetrieveModel&amp;ProdName=Microsoft%20SQL%20Server%20Reporting%20Services&amp;ProdVer=11.0.2100.60" xmlns:msrs="http://www.microsoft.com/sql/reportingservices">An error occurred while loading the model for the item or data source 'http://win-lnj1eq8qsfv:16350/PowerPivotTestSite/PowerPivot Gallery/Sum of Sales Quota.xlsx'. Verify that the connection information is correct and that you have permissions to access the data source.</Message><MoreInformation><Source>Microsoft.ReportingServices.ProcessingCore</Source><Message msrs:ErrorCode="rsErrorOpeningConnection" msrs:HelpLink="http://go.microsoft.com/fwlink/?LinkId=20476&amp;EvtSrc=Microsoft.ReportingServices.Diagnostics.Utilities.ErrorStrings&amp;EvtID=rsErrorOpeningConnection&amp;ProdName=Microsoft%20SQL%20Server%20Reporting%20Services&amp;ProdVer=1.0" xmlns:msrs="http://www.microsoft.com/sql/reportingservices">Cannot create a connection to data source 'TemporaryDataSource'.</Message><MoreInformation><Source>Microsoft.AnalysisServices.AdomdClient</Source><Message>A connection cannot be made. Ensure that the server is running.</Message><MoreInformation><Source>Microsoft.AnalysisServices.SharePoint.Integration</Source><Message></Message><MoreInformation><Source>Microsoft.AnalysisServices.SharePoint.Integration</Source><Message>The PowerPivot service application could not connect to the Analysis Services instance.</Message></MoreInformation></MoreInformation></MoreInformation></MoreInformation></MoreInformation><Warnings xmlns="http://www.microsoft.com/sql/reportingservices" /></detail>
