[Inf-IT DAVcl] Empty address books from owncloud CardDav using CardDavMate

Hi, I have set up CardDavMate to connect to my ownCloud Server for testing purposes. It is set up on the same domain using a static setup. I get a list of address books OK but the address books show up as empty and I get these errors on the browser debug console: REPORT XHR https://mydomain.com/remote.php/carddav/addressbooks/1f58a300-382a-1032-88a7... [HTTP/1.1 415 Unsupported Media Type 170ms] "Error: [CardDAVnetLoadCollection: 'REPORT https://mydomain.com/remote.php/carddav/addressbooks/1f58a300-382a-1032-88a7...'] code: '415' status: 'error'"

Any ideas please? Thanks Stephen P.