This is my lead creation xml

<?xml version='1.0' encoding='UTF-8'?><Leads><row no='1'><FL val='Lead Source'>Web Download</FL><FL val='Company'>MHS</FL><FL val='First Name'>Hannah</FL><FL val='Last Name'>Smith</FL><FL val='Email'> testing@testing.com</FL><FL val='Title'>Manager</FL><FL val='Phone'>1234567890</FL><FL val='Home Phone'>0987654321</FL><FL val='Other Phone'>1212211212</FL><FL val='Fax'>02927272626</FL><FL val='Mobile'>292827622</FL></row></Leads>

The response is same as many people have been getting, Please help. The XML is same as the sample on your site. So hope it should be correct.

<response><error><code>4600</code><message>Unable to process your request. Please verify if the name and value is appropriate for the "xmlData" parameter.</message></error></response>