TCPDF error: Image file has no extension and no type was specified: data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACoAAAAqCAIAAABKoV4MAAAAHElEQVRYhe3BAQ0AAADCoPdPbQ43oAAAAAAAngwU1gABsbwRgAAAAABJRU5ErkJgggA=