Общий конструктор по умолчанию для "<var>X</var>" отсутствует. Возможно, это указано в теге "<var>X</var>" , или это тип по умолчанию для элемента свойства.

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There is no public default constructor for '<var>X</var>'. This might be referenced by a '<var>X</var>' tag, or it might be the default type for a property element.

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