Unable to serialize the session state

[Adam]

I am generating a reporting dynamically which includes a gantt chart (dynamically creating the gantt chart along with the data - series). The report runs fine on my development server. However, when I promote the report to production, I receive the following error:

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Unable to serialize the session state. In 'StateServer' and 'SQLServer' mode, ASP.NET will serialize the session state objects, and as a result non-serializable objects or MarshalByRef objects are not permitted. The same restriction applies if similar serialization is done by the custom session state store in 'Custom' mode.
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The site is setup to use "SQLServer" Session mode. And, I noticed in some of the very old posts to this forum, that this was a problem with early versions of telerik reporting. I am using the latest version and still seeing this problem. Is there a work-around besides going back to "InProc" session mode?

Thanks!

[Chavdar]

Hello Adam,

One of the possible reasons for the problem is when a class which cannot be serialized binary is used for a data source. It could be also another problem but to investigate it we will need a runnable project which reproduces the issue or the complete stack trace of the exception. If you would like to send us a project you should open a support ticket for this.

Kind regards,
Chavdar
the Telerik team