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You are using v3 syntax while using v2, this wont work, you need to declare all y axes in a single array and all x axes in a singel array, for more info check out the v2 documentation.
Example:
var options = {
type: 'line',
data: {
labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
datasets: [{
label: '# of Votes',
data: [12, 19, 3, 5, 2, 3],
borderColor: 'pink',
fill: false
}]
},
options: {
scales: {
yAxes: [{
ticks: {
min: 0,
max: 40
}
}]
}
}
}
var ctx = document.getElementById('chartJSContainer').getContext('2d');
new Chart(ctx, options);
<body>
<canvas id="chartJSContainer" width="600" height="400"></canvas>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.4/Chart.js"></script>
</body>
Source:stackexchange.com