jade이용해 문서 변환시 에러

docbook쓸려고 sgml 문서 만든후...
nsgml -sv 문서명
일케 하면... 에러 없이 끝납니다.
문서에 에러 없는거 확인하고
jade 를 이용해 문서 변환을 할때...
다음과 같은... 메세지가 화면에 뜨고... 변환이 이루어 지지 않습니다.
원인이 무엇인지요?

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