Chrono Trigger Portal error

Umm.. I know that is asked 1000 times but:In very first chapter ,I cant pass the blue teleport screen. I use a R4 and my flashcard is full of games. Is it becouse of fullness or just a typical error??And how can I solve it?

well first try the crackers patchhttp://www.mediafire.com/?jqylgzmjwm2Worked perfect for me

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