관리자페이지에서 전체메뉴관련 질문드립니다.

관리자페이지에서 전체메뉴케쉬생성을 하면 아래와 같은 오류메세지가 출력이 됩니다.
왜 그런건지 고수님들에게 질문 드립니다.
얼마전까지는 안생겼는데....왜 이런게 생기는 건가요??

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Warning: fclose(): supplied argument is not a valid stream resource in F:\public_html\hwado\ver1\lib\mw.cache.lib.php on line 61

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