in my master page, I have RadScriptManager control, and RadAjaxPanel,
as I an new in rad controls, I was following a video to very basic update a lable without postback (http://tv.telerik.com/watch/aspnet/radajax/radajax-overview
), when I run my site, after I click the link button to update the lable, somethimes I got this error:
Microsoft JScript runtime error: Sys.WebForms.PageRequestManagerServerErrorException: Invalid JSON primitive: .
so how shall I solve it?