Adding Data in Mobile Publisher

Using a DataSet stored in SSRS...when I try and load the data through the Mobile Publisher the following error occurs...

Microsoft.ReportingServices.Portal.WebHost!reportserverwebapp!31!06/15/2016-11:40:13:: e ERROR: [jvos7bu5]: There was a problem getting data from the Report Server Web Service: System.Web.Services.Protocols.SoapException: An error has occurred during report processing. ---> Microsoft.ReportingServices.ReportProcessing.ProcessingAbortedException: An error has occurred during report processing. ---> Microsoft.ReportingServices.ReportProcessing.DataSetExecutionException: The execution failed for the shared data set 'DataSet1'. ---> Microsoft.ReportingServices.ReportProcessing.ReportProcessingException: Cannot read the next data row for the dataset DataSet1. ---> Microsoft.AnalysisServices.AdomdClient.AdomdConnectionException: The connection either timed out or was lost. ---> System.IO.IOException: Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host. ---> System.Net.Sockets.SocketException: An existing connection was forcibly closed by the remote host

   at Microsoft.ReportingServices.Library.ReportExecution2005Impl.InternalRender(String Format, String DeviceInfo, PageCountMode pageCountMode, Stream& Result, String& Extension, String& MimeType, String& Encoding, Warning[]& Warnings, String[]& StreamIds)

   at Microsoft.ReportingServices.Library.ReportExecution2005Impl.Render(String Format, String DeviceInfo, PageCountMode pageCountMode, Byte[]& Result, String& Extension, String& MimeType, String& Encoding, Warning[]& Warnings, String[]& StreamIds)

   at Microsoft.ReportingServices.WebServer.ReportExecutionService.Render2(String Format, String DeviceInfo, PageCountMode PaginationMode, Byte[]& Result, String& Extension, String& MimeType, String& Encoding, Warning[]& Warnings, String[]& StreamIds)

The dataset was created in ReportBuilder and used SSAS as the DataSource

NOTE...when Previewing the data inside the new SSRS Web Portal I have no issue. 

Any ideas of the possible problem?

Thanks

Mark