I have read the solution on [this](https://stackoverflow.com/questions/11376665/object-has-no-method-getcolumntype) post but cannot seem to fit it to my issue. I am using google charts to build a line chart. x-axis being a date, y-axis being an integer.

When I run my code I get a large error message 

> 
> Object {"it then lists all my JSON formatted data"} has no method 'getColumnType'.
> 
> 
> 

I am getting my JSON chart data from a web service via an AJAX call. My code so far

```
<script type="text/javascript">

            google.load("visualization", "1", { packages: ["corechart"] });
            google.setOnLoadCallback(drawChart);

            function drawChart() {
                var jsonData = $.ajax({
                    url: "WebService.asmx/HelloWorld",
                    data: "{}",
                    contentType: "application/json; charset=utf-8",
                    dataType: "json",
                    async: false
                }).responseText;

                var options = {
                    title: 'Company Performance'
                };

                var chart = new google.visualization.LineChart(document.getElementById('chart_div1'));
                chart.draw(jsonData, options);
            }

    </script>

```