"No parameterless constructor defined for this object" error on Telerik Reporting

[Lea]

I created a report and I'm encountering this error. My main report is doing fine, but my sub-reports are not. The error is 

"An error has occurred while processing SubReport 'SubReport1': Invalid report type ------------- InnerException ------------- No parameterless constructor defined for this object."

I have 2 sub-reports both of them have this error. The way I connected my main report to its data source which is an XML file located on my hard disk is the same with connecting 2 sub-reports. Can someone tell me what causes this error?

Environment: vb.net, xml data source, .net 4.0, visual studio 2012

[KS]

Hi,

Now, if it is a web app, and the session state is StateServer or other out-of-process mode set all of these rules - Design Considerations for Out-proc Session State. And if anything is specified via Type.AssemblyQualifiedName, the type must have default parameterless constructor (via reflection there must be created an instance with that name).

-KS

[Lea]

Hi Ks, thanks for always responding to my inquiries. 

[Scott]

How do we deal with this exact same error when using C# Winforms?

Thank you!

[Nasko]

Hello Scott,

Make sure that all of your reports have a parameterless constructor. If you want to pass any data to the report, please use report parameters instead of passing arguments via the report's constructor.

Modifying the default report's constructor to accept arguments is not a recommended practice.

Regards,
Nasko
Telerik by Progress

[Scott]

Hi Nasko-

That was exactly it.  Thank you!

-Scott