svn: Can't convert string from 'UTF-8' to native encoding

FreeBSD:
    Q:    svn: Can't convert string from 'UTF-8' to native encoding
    A:    #locale
            LANG=
            LC_CTYPE="C"
            LC_COLLATE="C"
            LC_TIME="C"
            LC_NUMERIC="C"
            LC_MONETARY="C"
            LC_MESSAGES="C"
            LC_ALL=

            export LC_CTYPE="zh_CN.UTF-8"

            #locale
            LANG=
            LC_CTYPE=zh_CN.UTF-8
            LC_COLLATE=zh_CN.UTF-8
            LC_TIME="C"
            LC_NUMERIC="C"
            LC_MONETARY="C"
            LC_MESSAGES="C"
            LC_ALL=