05 Feb 2005
27 Apr 2011
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I am currently running Sitefinity v. 3.7 SP4 on .Net 4.0.
I have a page which is running a custom ASP.Net User Control also running on ASP.Net 4.0. It is using Telerik RadControls from the Q1 2011 release. I have updated the Web.config file to perform a bindingRedirect of the Telerik.Web.UI assembly.
When I attempt to add a control from the Toolbox to my Sitefinity page, I receive an error message that states "Cannot unregister UpdatePanel with ID "" since it was not registered with the ScriptManager. This might occur if the UpdatePanel was removed from the control tree and later added again, which is not supported. Parameter name: updatePanel"
I have attached a screenshot for review.