电脑安装了OX，能成功运行MSVAR (c) H-M Krolzig, 1996-2005，但是运行自己编的代码时，却出现以下结果：
Ox version 3.40 (Windows) (C) J.A. Doornik, 1994-2004
MSVAR (c) H-M Krolzig, 1996-2005, package version 1.32a, object created on 31-12-2003
No observations available in selected sample
C:\hmk\MSVAR\INCLUDE\MsvarEm.ox (478): Estimate
C:\Program Files\Ox\packages\msvar\quarter.ox (13): main

我编的代码如下，请高手帮忙看看哪里出了问题：

#include <oxstd.h>
#import  <msvar130>
main()
{
    decl time=timer();
    decl msvar = new MSVAR();
msvar->IsOxPack(FALSE);
msvar->Load("quarter.xls");
msvar->Select(Y_VAR, { "ggrow", 0, 4});
msvar->Select(S_VAR, { "rr", 0, 0});
msvar->SetSample(1993,1,2002,4);
msvar->SetModel(SR, 2);
msvar->Estimate();
}