TCPDF error: Image file has no extension and no type was specified: data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA0AAAAKCAIAAADgjEOTAAAAEUlEQVQYlWP4TxxgGFVHF3UAkqGEisFIAHYAAAAASUVORK5CYII=