TCPDF error: Image file has no extension and no type was specified: data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABEAAAAOCAYAAADJ7fe0AAAAIUlEQVQoz2P4jwQYoOA/iYBh8BgyeMBowI4GLD0CFmQGAJeZHQCjUvPAAAAAAElFTkSuQmCC