I see that you are getting an HDCP error, in order to eliminate that you can try using component cables. If the component cables are not and option you can always purchase an HDMI to component adapter. Below are some helpful links;
Sling Media Support Team
Anyone having luck getting the new Comcast XiD-P Xfinity box to work with the Slingbox 500? The new Comcast box does not have Component connections, and I cannot get a signal with HDMI only. I know there could be copy protection on some channels, but I can't get any channels to work.
Any ideas would be appreciated.