El tipo "%1.%2" está marcado para serialización nativa, pero el campo "%3" del tipo "%4.%5" es de tipo "%6.%7", que no está marcado con "LayoutKind.Sequential". La serialización nativa requiere que el tipo esté marcado con "LayoutKind.Sequential".
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English version
Type "%1.%2" is marked for native serialization, but field "%3" of type "%4.%5" is of type "%6.%7", which is not marked with "LayoutKind.Sequential". Native serialization requires the type to be marked with "LayoutKind.Sequential".