Член данных "<var>Member</var>" типа "<var>Type Name</var>" не является частью сопоставления для типа "X". Член расположен над корнем иерархии наследования?

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Data member '<var>Member</var>' of type '<var>Type Name</var>' is not part of the mapping for type 'X'. Is the member above the root of an inheritance hierarchy?

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