View Compilation Error

0_0_5343092_47.cpp
0_0_5343092_47.cpp(43) : error C2039: "back" : ??"std::basic_string<_Elem,_Traits,_Ax>"???
        with
        [
            _Elem=char,
            _Traits=std::char_traits<char>,
            _Ax=std::allocator<char>
        ]
0_0_5343092_47.cpp(48) : error C2039: "back" : ??"std::basic_string<_Elem,_Traits,_Ax>"???
        with
        [
            _Elem=char,
            _Traits=std::char_traits<char>,
            _Ax=std::allocator<char>
        ]
0_0_5343092_47.cpp(48) : error C2039: "back" : ??"std::basic_string<_Elem,_Traits,_Ax>"???
        with
        [
            _Elem=char,
            _Traits=std::char_traits<char>,
            _Ax=std::allocator<char>
        ]
0_0_5343092_47.cpp(48) : error C2039: "back" : ??"std::basic_string<_Elem,_Traits,_Ax>"???
        with
        [
            _Elem=char,
            _Traits=std::char_traits<char>,
            _Ax=std::allocator<char>
        ]