[XeTeX] The \fontspec commad's option "ExternalLocation" can't coexist with "BoldFont" or "ItalicFont" option ?

[moneylcj]

hello,When I used this command:

         \fontspec[BoldFont={Book Antiqua},ExternalLocation={e:/moneylcj/font/}]{fzboyasong.ttf}

Error occured:
        Couldn't find `I.cfg'
        maketfm: No creation rule for font ICU.

       ! Font \@tempfontb="[e:/moneylcj/font/Book Antiqua]/ICU" at 10.0pt not loadable
       : Metric (TFM) file or installed font not found.
       \\zf at make@font at shapes ...f at suffix " at \f at size pt
                                                       \edef \@tempb {\fontname \...
       l.24 ...ation={e:/moneylcj/font/}]{fzboyasong.ttf}

my os is windows xp and Tex distribution is MikTex 2.7, XeTex is 0.9997。
How can i do?
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