ASP.NET Ajax Error: Sys.WebForms.PageRequestManagerParserErrorException

Question

My website has been giving me intermittent errors when trying to perform any Ajax activities. The message I get is

Sys.WebForms.PageRequestManagerP         


        

Answer 1

Probably there is an error occuring on post back. In this case, you can view the details about the error by adding a PostBackTrigger to your updatepanel and referencing the button which causes the problem: