I can not do multiplayer and campaign duel ... and always appears task "The game can not proceed. one or both decks Contain cards that are not valid for this match."
What is this? I have this problem ... please help me?
You should play the game without any hacks first, so you can get used to play the game and learn the basics. The error is not about any hacks, it's just about using cards which are not permitted for some particular matches.
This is a hack request which goes beyond the scope of this topic. I don't know which hacks you used in the past, but I can only provide unlimited YGO Points and my hack does not interfere with the use of Forbidden Cards at all.