I've been trying to find a cause for this error for some time to no avail...
We have a SharePoint 2007 site heavily customized in terms of look and feel.
In the master page a user control has been inserted that uses an update panel to partially render updates in the control.
The User control seems to work fine on all pages unless a search web part is inserted into the page.
The control has a DropDownList that according to user choice hides or shows different panels. There are also buttons that cause async postbacks within each of the panels.
The javascipt error is:
Sys.WebForms.PageRequestManagerServerErrorException: Object reference not set to an instance of an object.
The problem is I can't even figure out what this object is. It seems to be the ScriptManager (although its there in the master page).
Is there a way to get a detailed description of this error? Also, are there are any known conflicts or issues with update panels and SharePoint search web parts?