My Wii is giving the me the same issue. I just hacked my Wii (and upgraded from 3.3 to 4.1) following Dogeggs' guide "New 3.1-4.1 Softmod for ANY Wii" here: http://www.wiihacks.com/recommended-...d-any-wii.html
Now I get this error when I try to load an original disk. The Wii will play anything I put on the WBFS drive just fine. What could I have done wrong?