sysfile_read returning error -39

Hi All

I have some code in my external that reads from a file using sysfile_read. On WinXP everything works fine but on Mac OSX sysfile_read returns error -39. I looked in the SDK docs but could find no way to convert this error number into a human readable string. This is what i get in the max window :

• error: error -39 reading file Macintosh HD:/Users/bschiett/sandbox/c3max/trunk/pwm.bin (18956 bytes read)

    fwBuffer = (char*) sysmem_newptrclear(sizeof(char) * LIMIT);

    if (fwBuffer)
    {
        err = path_opensysfile(s->s_name, path_getdefault(), &handle, READ_PERM);

        if (err)
            error("error %d opening file %s", err, s->s_name);
        else
        {
            post("reading from %s ...", s->s_name);

            // read raw data from .bin file into buffer
            count = ( long)(sizeof(char) * LIMIT);
            err = sysfile_read(handle, &count, fwBuffer);

            // make sure we read all data
            if (err)
                error("error %d reading file %s (%d bytes read)", err, s->s_name, count);
            else
            {
                ...
            }

            // close file
            sysfile_close(handle);
        }

        // free memory
        sysmem_freeptr(fwBuffer);
    }
    else
    {
        error("failed to allocate memory ", 0);
        return;
    }