Thank you for reaching out to the answer forum. From the error that you posted it shows that the Slingbox that you are trying to connect to is not supported by the Slingbox player. I will post a compatibility chart below that will help you understand why you are getting this error. What Slingbox are you trying to connect to? The iPad Slingplayer for the Solo and up. Any device older than the Solo will not work with that Slingplayer.
Hope this helps,
Sling Moderation Team