[Help] error MVS2013 topic

What's the problem?
Source is fully functional, but here comes this error:

Code:

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IntelliSense: no operator "! =" Matches these operands
operand types: std :: ofstream! = int

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Here is the code I have in the source

Code:

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void __cdecl cTools::Log(const char *fmt, ...)
{
        if(ofile != NULL)
        {
                if(!fmt)
                {
                        return;
                }
                va_list va_alist;
                char logbuf[256] = {0};
                va_start (va_alist, fmt);
                _vsnprintf (logbuf+strlen(logbuf), sizeof(logbuf) - strlen(logbuf), fmt, va_alist);
                va_end (va_alist);
                ofile << logbuf << endl;
        }
}

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Once again, I use a Visual Studio 2013

Error highlighted in red