Sys.WebForms.PageRequestManagerServerErrorException: An unknown error occurred while processing the

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    Sys.Application.add_load(function() {        var form = Sys.WebForms.PageRequestManager.getInstance()._form;        form._initialAction = form.action = window.location.href;    });    if (!document.all) {        window.onbeforeunload = function() {            Sys.WebForms.PageRequestManager.getInstance().add_endRequest(endRequest);        }    }    function endRequest(sender, e) {        err = e.get_error();        if (err) {            if (err.name == "Sys.WebForms.PageRequestManagerServerErrorException") {                e.set_errorHandled(true);            }        }    }