dvmac on "[Plugin: Contact Form 7 to REST Call] Request format is invalid: text/xml. error"

Hi there,
I recently found this plugin which seems to do exactly what I need but I keep receiving this error:
Request format is invalid: text/xml.

I just wanted to check that I understand correctly. Can this plugin take Contact Form 7 data and send to an external database using xml?

Do I need to include some kind of response?

Any help is greatly appreciated.

Regards,

David H

http://wordpress.org/plugins/contact-form-7-to-rest-call/