Whats the frequency of the letter u in:
Q: Data column(s) for axis #0 cannot be of type string - Chart Как исправить ошибку?

Data column(s) for axis #0 cannot be of type string

Код:
<table cellspacing=0 cellpadding=0 border=1 id=viaduct_table>
    <tbody>
        <tr>
            <td></td>
            <td rowspan=1 colspan=4>Количество предлагаемых обьектов</td>
        </tr <tr>
        <td>Дата</td>
        <td>1 к.кв</td>
        <td>2 к.кв</td>
        <td>3 к кв</td>
        <td>4 к. кв</td>
        </tr>
        <tr>
            <td>3/6/2014</td>
            <td>144</td>
            <td>134</td>
            <td>73</td>
            <td>8</td>
        </tr>
        <tr>
            <td>4/6/2014</td>
            <td>131</td>
            <td>120</td>
            <td>69</td>
            <td>10</td>
        </tr>
        <tr>
            <td>5/6/2014</td>
            <td>150</td>
            <td>128</td>
            <td>65</td>
            <td>11</td>
        </tr>
        <tr>
            <td>6/6/2014</td>
            <td>129</td>
            <td>136</td>
            <td>77</td>
            <td>9</td>
        </tr>
    </tbody>
</table>

<script type=text/javascript src=//www.google.com/jsapi></script>
<script type=text/javascript>
    google.load(visualization, 1, {
        packages: [corechart]
    });
</script>
<script type=text/javascript>
    function drawViaduct() {
        // Create and populate the data table.
        /*var data = google.visualization.arrayToDataTable([
                    [Дата, 1 к.кв, 2 к.кв, 3 к.кв, 4 к.кв],
                    [3/6/2014,    144,    134,    73,     8],
                    [4/6/2014,    131,    120,    69,     10],
                    [5/6/2014,    150,    128,    65,     11],
                    [6/6/2014,    129,    136,    77,     9]
                 ]);*/

        var json = [];
        $(#viaduct_table tr).each(function (index) {
            if (index != 0) {
                var json2 = [];
                $(this).find(td).each(function (index) {
                    json2.push($(this).text());
                });
                json.push(json2);
            }
        });

        console.log(json);

        var data = google.visualization.arrayToDataTable([json]);

        // Create and draw the visualization.
        new google.visualization.ColumnChart(document.getElementById(viaduct)).
        draw(data, {
            title: ,
            colors: [#5a4671, #8064a2, #a693be, #ccc1da],
            width: 600,
            height: 400,
            hAxis: {
                title: 
            }
        });
    }

    google.setOnLoadCallback(drawViaduct);
</script>

user
The text includes twenty "u"s in total.
assistant