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Our ASP.NET web forms PivotClient excel/pdf/word export was working ok until we updated our pivot nuget package to version from PivotClient datasource is relational.

Now if same data is exported with same code, server -side function PivotClient1_ServerExporting(ByVal sender As Object, ByVal e As Syncfusion.JavaScript.Web.PivotClientEventArgs)
will throw error: 

The given key was not present in the dictionary.



Here's client side code:

      function exporting(args) {

                 //ClientMode export

                 args.url = "pivotClientExport"


and control:

<ej:PivotClient ID="PivotClient1" runat="server" Title="Vessel Emission Browser" IsResponsive="true" ServerExporting="PivotClient1_ServerExporting"  GridLayout="ExcelLikeLayout" ShowReportCollection="false" ClientIDMode="Static" CollapseCubeBrowserByDefault="true" Locale="en-US" ClientExportMode="ChartAndGrid">


  <ClientSideEvents Load="onLoad" BeforeExport="exporting">

Best regards,