Runtime exception after adding a column to the report

[Beginner]

I just right click on the report table in visual studio report designer and choose insert column.
It's just a blank column, with no logic.
When i run the report, it throw the following exception:

"message":"","exceptionMessage":"Object reference not set to an instance of an object.",

"exceptionType":"Telerik.Reporting.Services.Engine.DocumentRenderException","stackTrace":"
at Telerik.Reporting.Services.Engine.Document.GetDocumentInfo()
at Telerik.Reporting.Services.WebApi.ReportsControllerBase.GetDocumentInfo(String clientID, String instanceID, String documentID) in c:\\temp\\reporting\\RBuild-28199\\Reporting_Build\\Source\\Code\\Telerik.Reporting.Services.WebApi\\ReportsControllerBase.cs:line 291
at lambda_method(Closure , Object , Object[] )
at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor.<>c__DisplayClass10.<GetExecutor>b__9(Object instance, Object[] methodParameters)
at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ExecuteAsync(HttpControllerContext controllerContext, IDictionary`2 arguments, CancellationToken cancellationToken)

--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Web.Http.Controllers.ApiControllerActionInvoker.<InvokeUsingResultConverterAsync>d__8.MoveNext()
--- End of stack trace from previous location where exception was thrown --

at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Web.Http.Controllers.ActionFilterResult.<ExecuteAsync>d__2.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Web.Http.ApiController.<InvokeActionWithExceptionFilters>d__1.MoveNext()"}

This exception just throw to web client and visual studio debugger and intellitrace can't record it.
I can see that there are some files have written in the report folder on the hard disk drive.
After removing that column from my report, everything work fine.
Can anyone explain why this happen and how can i fix this?

[Beginner]

Note that my report version is 11.0.17.222

[Katia]

Hello Beginner,

Check if the version of Telerik Reporting the report was created with is the same as the version referenced in the project that hosts Reporting REST service. You can use Upgrade Wizard to update both projects to the same version.

It might also be that the Table item became corrupted, however, we cannot reproduce this behavior on our side. You can test deleting the table and recreating it again or/and upgrading the product to a newer version. 
It is also not recommended to modify reports or add new report items with custom code.

I hope this information will help.


Regards,
Katia
Progress Telerik