Chartjs-Chart Js Doughnut chart giving error

The syntax is different if you are using Chart.js v1 or v2.

And you said you imported the v2 library, but you are still using the v1 syntax with :

var chart = new Chart(ctx).Doughnut(data);

To fix this, you can change the syntax to the v2’s :

var myChart = new Chart(ctx, {
    type: 'doughnut',
    data: data
});