json parse error unexpected end of data.

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ASP.NET

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Hi,
i have some functionality to pass id via json. but it returns below error

JSON.parse: unexpected end of data

i have no idea why not working on production server. works fine on my local mahchine. here is my code.

function AddSubscriptionToList(PublicationID, EmployeeID) {

        var pubid = { "PublicationID": PublicationID, "EmployeeID": EmployeeID };
        $.ajax({
            url: '@Url.Action("AddSubscriptionToDB", "Home")',
            cache: false,
            type: 'POST',
            dataType: 'json',
            contentType: 'application/json; charset=utf-8',
            data: JSON.stringify(pubid),
            success: function (data) {
                //alert('added');
                loadPublicationList();
            }
        }).fail(
                 function (xhr, textStatus, err) {
                     alert(err);
                 });
    }