Sys.InvalidOperationException: component was not found.

[kalyan gupta]

Hi @

I am using Telerik Rad list boxes in my application The list box's are inside Telerik:RadAjaxPanel. I some time get the following error when the page with RadListbox loads.

This is a show stopper in my application. I am forced to go back to asp:list boxes.

The content page is inside a Nested Master Page and master page contain the Rad tab strip.

Please help me how to get rid of this Issue.

Webpage error details

User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; .NET4.0C; .NET4.0E)
Timestamp: Wed, 9 Mar 2011 09:47:16 UTC

Message: Sys.InvalidOperationException: Component 'ctl00_ctl00_ContentPlaceHolder1_Main_uclFieldSelection_RHSListBox' was not found.
Line: 4599
Char: 25
Code: 0
URI: ScriptResource.axd?d=qlvRxOrmpywM_08z8refchHddcbVZsvK4Ywotss_Ymd_2hJVYkLcDxVnLi_OeSkv8B6tfayteJ6SVeKd7o_DwYe4725KqPpiYzA653aPMP_F0rYUNPf5bufsZONZE3BA1W0wDg2&t=ffffffffcb989f59

I have tried the following options without any success:
1) Made sure that ScriptResource.axd reference is in web.config <httphandlers> and <handlers> section.
2) I have replaced the telerik:radajaxpanel with asp:updatepanel
3) I have removed all the client side events from the list boxes.
4) I have made sure that order of ScriptManager is at the top of any other controls

Please suggest me how to proceed.

[kalyan gupta]

Any Inputs on this? This is very urgent, Please some one respond.

[Genady Sergeev]

Hi kalyan gupta,

Could you please provide us with more information regarding your scenario. How is the error reproduced, what actions should be undertaken?

Kind regards,
Genady Sergeev
the Telerik team