Negezor, what's wrong?

main.js

let { VK } = require('vk-io')
  , { createCanvas } = require('canvas');

let canvas = createCanvas(1590, 400, 'svg')
  , ctx = canvas.getContext('2d');

let {updates,upload} = new VK({
  token: 'tokentokentokentokentokentokentokentokentokentokentokentokentokentokentokentoken'
});

ctx.fillText('Testin\'', 30, 30);

upload.groupCover({
  source: canvas.toBuffer(),
  group_id: 172953153
});