Commented Unassigned: UpdatePanelAnimationExtender - Object reference not set to an instance of an object [27979]

Hi,

When I try to use UpdatePanelAnimationExtender I'm always getting the error Object reference not set to an instance of an object.
My project worked fine until I updated Ajax Control Toolkit to version 15.1.4

Thank you,
Comments: Hi Mikhail, I attach one aspx file of my project that throws "Object reference not set to an instance of an object" at AjaxControlToolkit.UpdatePanelAnimationExtender.OnPreRender. All pages are now failing but working fine with AjaxControlToolkit version 09/2011. If I create a new page with an UpdatePanel and an UpdatePanelAnimationExtender it works. Thanks a lot for your attention,