Google Pie Chart type mismatch
<p>I'm creating a pie chart using Google Charts, and I get this error:</p>

<blockquote>
  <p>Uncaught Error: Type mismatch. Value 720 does not match type date in column index 1</p>
</blockquote>

<p>My code is the following:</p>

<pre><code>var graphData = [
    [
       'Occupation',
       {type: 'number'},
       {type: 'string', role: 'tooltip', 'p': {'html': true}}
    ],
    ['Training', 720, '&lt;div class="pie-tooltip"&gt;Training&lt;br/&gt;&lt;strong&gt;12 hours &lt;/strong&gt;&lt;/div&gt;']
];

var data = google.visualization.arrayToDataTable(graphData);

var options = {
    is3D: true,
};

var chart = new google.visualization.PieChart(document.getElementById('field-occupation-graph'));
chart.draw(data, options);
</code></pre>

<p>The <code>{type: string}</code> after <code>Occupation</code> is something I changed to avoid the same error. I had the value <code>'Time'</code> in there, and the error, instead of saying <code>720</code> said <code>Time</code>. Basically the same error but with the headers of the chart.</p>

<p>I don't know from where comes this error of type <code>date</code>, this chart is not using dates at all.</p>

<p>I'm clueless here, so any help would be very much appreciated. Thanks!</p>