White screen in FIRE EMBLEM FATE

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Hello, when I try to marry some character of the game when trying to unlock the S range of support the game remains blank and I can not make it happen from that moment, apparently it was already a forum with the Solution but I can not understand the steps correctly and I can not correct the error, I hope you can help me because I am “slow” and I did not understand well, thank you in advance.

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