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Error while rendering "HTML 5 Report Viewer" on client side

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Yashad asked on 19 Sep 2017, 03:42 PM


I have created a Telerik Reporting REST service in order to render "telerik reports" on my Web Application in HTML 5 view. I am currently using the following code on my Web Application page "Report.aspx" to consume the service.

 <script type="text/javascript">
                serviceUrl: "http://localhost:62355/api/reports/",
                templateUrl: '/ReportViewer/templates/telerikReportViewerTemplate.html',
                reportSource: {
                    report: "VB.ReportLibrary.ReportCatalog, VB.ReportLibrary",
                    parameters: {

                viewMode: "ViewModes.INTERACTIVE",
                scaleMode: "ScaleModes.SPECIFIC",
                scale: "1.0",
                PersistSession: "true"


When I open "Report.aspx" it throws an error "Client with ID '[object Object]' not found. Expired" on locally running Service App (See attached image "ServiceError.jpg"). At the same time client side(Web App page Report.aspx) shows an alert message "Gone" (See Image 410_Gone.jpg). ReportsController.vb code is as follows:

Imports Telerik.Reporting.Cache.Interfaces
Imports Telerik.Reporting.Services.Engine
Imports Telerik.Reporting.Services.WebApi
Imports System.IO
Imports System.Web.Http.Cors

'The class name determines the service URL.
'ReportsController class name defines /api/report/ service URL.

<EnableCors("http://localhost:53274", "*", "*")>
Public Class ReportsController
    Inherits ReportsControllerBase

    Shared configurationInstance As Telerik.Reporting.Services.ReportServiceConfiguration

    Shared Sub New()
        'This is the folder that contains the trdx or trdp report definitions
        'In this case this is the Reports folder
        Dim appPath = HttpContext.Current.Server.MapPath("~/")
        Dim reportsPath = Path.Combine(appPath, "Reports")

        'Add resolver for trdx report definitions,
        'then add resolver for class report definitions as fallback resolver;
        'finally create the resolver and use it in the ReportServiceConfiguration instance.
        Dim resolver = New ReportFileResolver(reportsPath) _
                       .AddFallbackResolver(New ReportTypeResolver())

        'Setup the ReportServiceConfiguration
        Dim reportServiceConfiguration As New Telerik.Reporting.Services.ReportServiceConfiguration()
        reportServiceConfiguration.HostAppId = "reportViewer1"
        reportServiceConfiguration.ReportResolver = resolver
        reportServiceConfiguration.Storage = New Telerik.Reporting.Cache.File.FileStorage()
        reportServiceConfiguration.ReportSharingTimeout = 0
        reportServiceConfiguration.ClientSessionTimeout = 9999
        configurationInstance = reportServiceConfiguration
    End Sub

    Public Sub New()
        'Initialize the service configuration

        Me.ReportServiceConfiguration = configurationInstance
    End Sub

    Protected Overrides Function CreateCache() As ICache
        Return Telerik.Reporting.Services.Engine.CacheFactory.CreateFileCache()

    End Function

End Class


Can you please provide a solution regarding same. My end goal is to render telerik report on web form page using html 5 report viewer (See expected_result.jpg).

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Telerik team
answered on 20 Sep 2017, 05:38 PM
Hello yashad,

You can check an update in support ticket #1131079 that was opened for the same issue.

In general, errors related to expired/missing ClientID can occur if you use the Reporting REST Service in a web farm or with load balancing, without using the correct Storage settings - REST Service Storage.

The reason is that with load balancing and FileStorage option you may have the cache folder created on different machines, unless you specify a common shared folder through the second overload of the FileStorage.

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