That type of error usually occurs when the API is not fully loaded. By
calling drawColumnChart from an onClick event, you don't have any means of
making sure the API is loaded before trying to draw it. Try this instead:
remove the onClick event from the 'myGraphLabel' div and add this to your
js:
google.setOnLoadCallback(init);
function init() {
document.getElementById('myGraphLabel').onclick = drawColumnChart;
}
This way, the onClick event will be registered after the API finishes
loading.
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