mPDF error: IMAGE Error (https://chart.googleapis.com/chart?chs=300x300&cht=qr&chl=https://newenglandautomall.com/cars-for-sale/2016-cadillac-escalade-esv-premium-collection-sanford-me-1756177/&choe=UTF-8): Error parsing image file - image type not recognised, and not supported by GD imagecreate