NintenDONT

So when I load up tekkit, my skin is steve. In the console I see this error: http://pastebin.com/qLDtnUqT (If that link doesn't work I uploaded an image: https://goo.gl/GUepOs When I open up a world my skin may load, but as soon as I die or go into a different dimension I get the same error. I turned off my firewall and stuff like that in case it was blocking it. I also searched this before and I couldn't find anything about it (and the ones I found weren't answered). I don't know if this happens in servers though or it's completely client-only. Any help would be appreciated.