mPDF error: IMAGE Error (https://chart.googleapis.com/chart?chs=300x300&cht=qr&chl=https://newenglandautomall.com/cars-for-sale/2017-mazda-mazda3-touring-4dr-sedan-6a-pawtucket-ri-1843346/&choe=UTF-8): Error parsing image file - image type not recognised, and not supported by GD imagecreate