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Cannot unregister UpdatePanel

2 posts, 1 answered
  1. Samir Vaidya
    Samir Vaidya avatar
    261 posts
    05 Feb 2005
    27 Apr 2011
    Link to this post
    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.

    Please advise.
  2. Georgi
    Georgi avatar
    3583 posts
    10 Oct 2016
    02 May 2011
    Link to this post
    Hi Samir Vaidya,

    Please check the following KB article - http://www.sitefinity.com/devnet/kb/sitefinity-3-x/cannot-unregister-updatepanel-with-id.aspx

    It's exactly about this issue. I hope this helps.

    All the best,
    the Telerik team
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2 posts, 1 answered