CustomBinding on the ServiceEndpoint lacks a TransportBindingElement

Error: The CustomBinding on the ServiceEndpoint with contract “” lacks a TransportBindingElement. Every binding must have at least one binding element that derives from TransportBindingElement.

My fix for this was adding the empty httpTransport markup to the web.config.

<customBinding>
  <binding name="...">
    ...
    <httpTransport></httpTransport>
  </binding>
</customBinding>

Via: http://antonis-antoniou.blogspot.com/2011/02/web-services-interoperability-between.html