Issue with program to AutoSave excel in C++

Dear Gurus/Experts in C++,

I am creating an automation tool, for that I have to autosave the excel with strings.I can read/write in excel, but when I try to

auto-save the excel I am getiing error, the same code I tried for saving the integers,its working but for string I am getiing error -

"IDispatch::GetIDsOfNames("saved")failed w/err 0x80020006". Please look at the code below and help me.

//Auto-save for Integers -- Working

x.vt = VT_I4;
x.bstrVal = ::SysAllocString(L"D:\\output.xls");
AutoWrap(DISPATCH_PROPERTYPUT, NULL, pXlBook, L"Saved", 1, x);

//Same for Strings -- Not Working

VARIANT fname;
fname.vt = VT_BSTR;
AutoWrap(DISPATCH_METHOD, NULL, pXlSheet, L"Saved", 1, fname);
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