TCPDF error: Unsupported image type: aspx?tnail=0&messageid=3e5cf508-66dd-11e0-a5b3-001e0bcbe7cc&aux=4%7c0%7c8cdc90129d1bef0%7c%7c0%7c0%7c0%7c0%7c%7c&maxwidth=220&maxheight=160&size=att