It seems that original Super Smash Bros. Brawl copies will give you an error if you are trying to play them on a a modified Wii console. More info inside…
Nintendo has received a lot of complains lately about people having trouble playing Super Smash Bros. Brawl. Nintendo has responded to these problems with the words that it’s caused by the use of a modified Wii. When you try to play the original copy of Super Smash Bros. Brawl on your modified Wii it will give you an error-message.
This message may also apear when the laser from your Wii is dirty. Nintendo will happily fix that problem though, for free. Nintendo won’t, obviously, help out the people who have got a modified Wii at any rate.