Thanks for using our Answers Forum. I understand that your getting an error when logging into your Slingplayer app on your Boxee box.
I am not familiar with the "error 3" that your getting, that sounds to me like a Boxee box error and I would recommend calling their support regarding that issue.
Hope this helps.
Sling Moderation Team
Just me or have http://forums.boxee.tv/ dropped of the face of the web?
Looking at the website it looks like they just want to forget about the older boxee box :/
If anyone else has any suggestions to tackle this issue they would be most welcome.