400 Bad Request for /api/reports/clients/{client_id}/parameters

[Yegor]

Hello,

I am trying to use HTML5 Report Viewer with MVC extension helper.

I have an error "Unable to get report parameters: Missing report name". It is happening during POST request to /api/reports/clients/210953-ab00/parameters which gets 400 Bad Request. 

I guess because request data do not have report: parameterValues: {} report: null

I call HTML helper like that:

    @(Html.TelerikReporting().ReportViewer()
        .Id("reportViewer1").ReportResolver(new TypeReportSourceResolver())
        .ServiceUrl("/api/reports/")
        .TemplateUrl(Url.Content("~/ReportViewer/templates/telerikReportViewerTemplate.html"))
        .ReportSource(new InstanceReportSource(){ReportDocument = new SessionReport()})
        .ViewMode(ViewModes.INTERACTIVE)
        .ScaleMode(ScaleModes.SPECIFIC)
        .Scale(1.0)
        .PersistSession(false)
    )

I have my ReportController implemented like:

public class ReportsController : ReportsControllerBase
    {
        protected override IReportResolver CreateReportResolver()
        {
            var reportsPath = HttpContext.Current.Server.MapPath("~/Reports");

            return new ReportFileResolver(reportsPath)
                .AddFallbackResolver(new ReportTypeResolver());
        }

        protected override ICache CreateCache()
        {
            return Telerik.Reporting.Services.Engine.CacheFactory.CreateFileCache();
        }
    }

And as I am using MVC5 with WepApi2 I have in my web.config following (I am not sure about last entry for Newtonsoft.Json):

      <dependentAssembly>
        <assemblyIdentity name="System.Web.Http" publicKeyToken="31bf3856ad364e35" />
        <bindingRedirect oldVersion="1.0.0.0-5.1.0.0" newVersion="5.1.0.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="System.Net.Http.Formatting" publicKeyToken="31bf3856ad364e35" />
        <bindingRedirect oldVersion="1.0.0.0-5.1.0.0" newVersion="5.1.0.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="Newtonsoft.Json" publicKeyToken="31bf3856ad364e35" />
        <bindingRedirect oldVersion="1.0.0.0-4.5.0.0" newVersion="4.5.0.0" />
      </dependentAssembly>

Can you help, please? Regards, Yegor.

[Stef]

Hello Yegor,

The HTML5 Report Viewer is entirely HTML/CSS/JS based widget, which needs the ReportViewer-x.x.x.x.js(css) and telerikReportViewerTemplate.html template files to work. It also requires a running instance of the Telerik Reporting REST Service - the possible service's implementations are Web API and ServiceStack based. By default we provide 

• ReportFileResolver -  works with TRDX files;
• ReportTypeResolver - works with assembly qualified names;

To create a Web application project that uses the viewer and the Reporting REST Web API for example,  follow the steps listed in the following articles:
1.     How To: Use HTML5 Report Viewer extension in an ASP.NET MVC application
2.     How To: Add Telerik Reporting REST Web API to Web Application

Then if you need to make customizations over the reports, you can use a Custom Report Resolver. The string received by the resolver's Resolve method comes from the set viewer's reportSource.report option (use the HTML5 Report Viewer jQuery widget for the purpose).

Regards,
Stef
Telerik

 

 

[Yegor]

Thank you!

My problem was that I have not used TypeReportSource with proper AssemblyQualifiedName, which is hard to enter manually.

Now to reduce hard-coding I use it like that:
@{
        var reportSource = new TypeReportSource() { TypeName = typeof(SessionReport).AssemblyQualifiedName };
        reportSource.Parameters.Add("SessionId", Model);
   }
@(Html.TelerikReporting().ReportViewer()
        .Id("reportViewer1")
        ...
        .ReportSource(reportSource)
        ...)

[amaeze]

Please I need your help telerik team.

I have followed the instruction on How To: Add Telerik Reporting REST Web API to Web Application. It was successfully deployed.However, I encountered this error :

{
    "message": "An error has occurred.",
    "exceptionMessage": "Object reference not set to an instance of an object.",
    "exceptionType": "System.NullReferenceException",
    "stackTrace": "   at Telerik.Reporting.Services.WebApi.ReportsControllerBase.CreateInstance(String clientID, ClientReportSource reportSource) in c:\\temp\\reporting\\RBuild-1382\\Reporting_Build\\Source\\Code\\Telerik.Reporting.Services.WebApi\\ReportsControllerBase.cs:line 180\r\n   at lambda_method(Closure , Object , Object[] )\r\n   at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor.<>c__DisplayClass6_1.<GetExecutor>b__3(Object instance, Object[] methodParameters)\r\n   at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor.Execute(Object instance, Object[] arguments)\r\n   at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ExecuteAsync(HttpControllerContext controllerContext, IDictionary`2 arguments, CancellationToken cancellationToken)\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n   at System.Web.Http.Controllers.ApiControllerActionInvoker.<InvokeActionAsyncCore>d__1.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n   at System.Web.Http.Controllers.ActionFilterResult.<ExecuteAsync>d__5.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n   at System.Web.Http.Controllers.ExceptionFilterResult.<ExecuteAsync>d__6.MoveNext()" 

 

whenever I try to create a report instance using a client ID 

Please help me

 

Kingsley

 

 

[Grant]

I'm getting same error as Kingsley - except only for 1 report, when run with 1 set of data (all other data sets work fine) - I get error:

"message": "An error has occurred.",
    "exceptionMessage": "Object reference not set to an instance of an object.",
    "exceptionType": "System.NullReferenceException",
    "stackTrace": "   at Telerik.Reporting.Services.WebApi.ReportsControllerBase.CreateInstance(String clientID, ClientReportSource reportSource) in c:\\temp\\reporting\\RBuild-1382\\Reporting_Build\\Source\\Code\\Telerik.Reporting.Services.WebApi\\ReportsControllerBase.cs:line 180\r\n   at lambda_method(Closure , Object , Object[] )\r\n   at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor.<>c__DisplayClass6_1.<GetExecutor>b__3(Object instance, Object[] methodParameters)\r\n   at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor.Execute(Object instance, Object[] arguments)\r\n   at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ExecuteAsync(HttpControllerContext controllerContext, IDictionary`2 arguments, CancellationToken cancellationToken)\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n   at System.Web.Http.Controllers.ApiControllerActionInvoker.<InvokeActionAsyncCore>d__1.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n   at System.Web.Http.Controllers.ActionFilterResult.<ExecuteAsync>d__5.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n   at System.Web.Http.Controllers.ExceptionFilterResult.<ExecuteAsync>d__6.MoveNext()" 

[Ivet]

Hello Grant,

The exceptionMessage": "Object reference not set to an instance of an object." means that if you try to access a member of a class instance using a null reference, then you get a System.NullReferenceException. Which is the same as Object reference not set to an instance of an object. 

This is a very common error and can occur because of all kinds of reasons. The root cause depends on the specific scenario that you've encountered. To help you better, could you please send me your report with working data so I can test it and try to find a solution to the issue? Also, could you send me the Trace log and Fiddler:

• Trace log for .NET Framework - How to: Create and Initialize Trace Listeners - .NET Framework | Microsoft Learn
• Trace log for .NET - How to troubleshoot errors in ASP.NET Core projects - Telerik Reporting
• Fiddler - The Ultimate Web Debugging Tool - Download Fiddler Everywhere | Telerik

  If you are hesitant to send your report and data here, you can open a ticket and provide the details there.