Microsoft JScript runtime error: Unable to get value of the property 'PageRequestManager': object is null or undefined

[Tinoy Malayil]

Hi Admin/Moderator ,

I have recently converted By Web Application from ASP.Net 2.0 to Asp.Net 3.5 to use the Telerik Version 2011.I have used the Telerik Version 2008 previously.After conversion the Ajax Version also converted from 1.0 to 3.5But getting the following error during application debugging.
Microsoft JScript runtime error: Unable to get value of the property 'PageRequestManager': object is null or undefined
I have used the property 'PageRequestManager in the Splitter control of Telerik Version 2008.
Could you please reply a solution?

Thanks,
Tinoy

[Dobromir]

Hi Tinoy,

Could you please, open the web.config file and look for this line:
<xhtmlConformance mode="Legacy"/>

Remove it and see if the problem still exists.

In addition, the xhtmlConformance element is usually added when an application is migrated from VS 2003 and unfortunately it is not compatible with the ASP.NET AJAX extensions. You can find more information on the subject in the following post:
http://weblogs.asp.net/scottgu/archive/2006/12/10/gotcha-don-t-use-xhtmlconformance-mode-legacy-with-asp-net-ajax.aspx.

Greetings,
Dobromir
the Telerik team