I typically see this when one of two things happens: 1) the script doesn't
load the visualization API properly, or 2) the script doesn't wait for the
API to finish loading before trying to use it. Make sure you have it set up
something like this:
google.load('visualization', '1', {packages: ['corechart']});
google.setOnLoadCallback(drawVisualization);
function drawVisualization() {
// create and draw the visualization
}
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