"Itunes could not sync the game ... bacause an unknown error ocurred(-50)

Hi evryone, i recently bought 5 games from Itunes for my ipod nano3G

Spore origins
Bomberman
UNO
Brain challange
Song Summoner

but i can only sync the games from gameloft
UNO
Brain challange

all the games are compatible with my ipod and the error is the same with all the three games

"Itunes could not sync the game "Spore Origins" bacause an unknown error ocurred.(-50)"
this only happens with three games, and the rest works fine,also all my songs works fine with my ipod.

i also tried this http://support.apple.com/kb/TS1539, i restored my ipod, fixed the dll registration, but i still get these errors, if anyone could help me with some link or information i would be glad.