ERROR 80040154, why ?

Dear friends,

i use gecko to parser a xml file to dom of gecko,
but there is a runtime error "NS_NewURI failed for file:///d:/file.xml - 80040154",
i am sure there are no problems with file "d:/file.xml"
and the codes i used is "extensions\xmlextras\tests\TestXMLExtras.cpp"
what's the error 80040154? unregistered dll?
thanks in advance!

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Best Regards,