Chart options are case sensitive. You specified "yaxis" when it should be "yAxis". It took me a while to notice!
series: [{ yAxis: 1, data: [29.9, 71.5, 106.4, 129.2, 144.0, 176.0, 135.6, 148.5, 216.4, 194.1, 95.6, 54.4] },{ yAxis: 0, data: [19.9, 21.5, 6.4, 29.2, 44.0, 76.0, 35.6, 48.5, 16.4, 94.1, 95.6, 54.4] }]
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