Class Has No Member Error

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C++

I'm getting an error on this code....do I need to add something to get the third line to return file size?

for(std::map<std::wstring,>::const_iterator it = map.begin(); 
        it != map.end(); ++it) 
    { 
        MessageBoxW(NULL,it->first.c_str(),L"File Name",MB_OK); 
        MessageBoxW(NULL,it->second.sLastAccessTime.c_str(),L"File Date",MB_OK);
	MessageBoxW(NULL,it->third.nFileSize.c_str(),L"File Size",MB_OK); 
    } 

The Error: 1 IntelliSense: class "std::pair" has no member "third"