TransformToFile does not work?

Hi all,

Im trying to convert a xml and xsl to an output file.
All the parameters (CString, CString, CString, XalanHandle) are valid.

But the last funtion:
ExecTransFormer(xml, xsl, outfile, Xhndl);
Returns to me -2, and the output file did not come out.

Does anyone know what -2 means and what is going wrong?
Below the code that I use in MFC C++ 6.0.



    // exec transformer
    typedef int (*ExecTransForm) (CString, CString, CString,
XalanHandle);
    CString xml, xsl, outfile;

    xml = "C:\\Xalan\\screen_about.xml";
    xsl = "C:\\Xalan\\screen_about.xsl";
    outfile = "C:\\Xalan\\screen_out.html";

    ExecTransForm ExecTransFormer =
       (ExecTransForm)GetProcAddress(XalanLib, "XalanTransformToFile");

    int i = ExecTransFormer(xml, xsl, outfile, Xhndl);  // gives me -2

Mervin.