Message in Korean (한국어)
구체화된 '<var>X</var>' 형식에서 null을 허용하는 '<var>Y</var>' 형식으로 캐스팅할 수 없습니다.
Unlocalized message
The specified cast from a materialized '<var>X</var>' type to a nullable '<var>Y</var>' type is not valid.
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