Not an apex domain
The domain host-1-54.txsaavp.sanantonio.tx.us.clients.pavlovmedia.net is not the root of its zone.
Instead, try zone transfer on txsaavp.sanantonio.tx.us.clients.pavlovmedia.net .
Instead, try zone transfer on txsaavp.sanantonio.tx.us.clients.pavlovmedia.net .