My platinum game has 67 hours a 45 minutes on it and when I saved at 67:47 after an egg hatched a blue error screen apeared and said "date card could not be read please shut of and reinsert data card". So I did and tried to save again but the screen apeared again. How come? Oh and I have not used any cheats or stuff like that.
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Only thing I can think of is the game might have gone bad. Nothing like that has happened on my game though. Take it out of the system and try again.
As you described the problem, it seems as if the only way to stop the screen from always appearing when you are trying to save is to start a new game.
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