[Solved] Grid OnError can't not access modelState

[yiming]

Here is the sample code:

function Grid_onError(args) {
    if (args.textStatus == "modelstateerror" && args.modelState) {
        var message = "Error: \n";
        $.each(args.modelState, function (key, value) {
            if ('errors' in value) {
                $.each(value.errors, function () {
                    message += this + "\n";
                });
            }
        });
        args.preventDefault();
        alert(message);
    }
}

My issue is while running on $.each(args.modelState, function (key, value) {
it just skip code inside $.each
args.modelState definite have errors, on firebug:

args.modelState:
Objectinserted[0].anaes_flag:
Objectinserted[0].antiboit:
Object__proto__: Object

Please help! Thanks.