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Error: 'Sys.WebForms.PageRequestManager' is null or not an object

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Medac
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Medac asked on 07 Apr 2010, 01:56 PM
Hi,

I have upgrated my VS 2005 application to VS 2010. But On my aspx page load I am getting following error.

Error: 'Sys.WebForms.PageRequestManager' is null or not an object

What are all the possible ways of getting this error? And I am not able to select any row in the RADGrid, not able open combobox.

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Princy
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answered on 07 Apr 2010, 02:25 PM
Hi Medac,

I read in a forum that the error means, the client object of the ScriptManager is missing and for some reason it is not created on the client. Make sure that you have added ScriptManager before any other controls on the page.

Also checkout the following forum links which discusses on similar topic:
FormDecorator Causes "'Sys.WebForms.PageRequestManager' is null or not an object" error
System.WebForms.PageRequestManager is null or not an object

Thanks,
Princy.
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Medac
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answered on 08 Apr 2010, 05:50 AM
HI Princy,

I am placing the script manager at first place above all the controls. But it didnt solve my problem. And also I have gone through the link which you have given. all were posted in 2008 & 2009. If I comment

<!--

 

 

<xhtmlConformance mode="Legacy"/>-->

 

 in web.config update panel will not work. In recent release of telerik has this issue been fixed?
Or how to go about this issue?
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Iana Tsolova
Telerik team
answered on 12 Apr 2010, 01:09 PM
Hi Medac,

Could you please confirm that EnablePartialRendering property of the ScriptManager is set to true?
Also, can you send us your web.config file for further investigation. Providing any additional information on your case might help us get to the source of the problem.

Regards,
Iana
the Telerik team

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Princy
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Medac
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Iana Tsolova
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