Jquery ajax – At JSON.stringify , parsererrorSyntaxError: Unexpected end of JSON input

At JSON.stringify , my javascript is giving the following message in the console.

parsererrorSyntaxError: Unexpected end of JSON input

var contentData =     {
                "Location": {
                    "City": "Bangalore Urban",
                    "State": "Karnataka",
                    "Country": "IN"
                },
                "Packages": [
                    "3 days and 4 nights"
                ],
                "Hotels": "Vividus",
                "Offers": [
                    "Enjoy up to 20% Savings",
                    "Hotel Discounts, Just for Booking Early.2 nights B&B to include first night dinner"
                ],
                "Activities": [
                    "scuba diving",
                    "swimming"
                ]
            }




        $.ajax({
            type : 'POST',
            url : '/my/reco/pkg.',
            data : JSON.stringify(contentData),
            async : false,    // I get this message both with false and true here.
            contentType : "application/json; charset=utf-8",
            success : function(data) {
                 console.log(data);

            },
            error : function(jqXHR, textStatus, message) {
                console.log("error"+jqXHR+textStatus+message);
            }
        });

When I put a debugger on in chrome, I see the error at the point JSON.stringify.

I have validated both json and the javascript code, both seems to be syntactically correct.

I can find the request json in the network tab under header section of chrome.

What am I doing wrong or missing here ?