View Compilation Error

0_0_5339909_21898.cpp
VC\include\xtree(992) : error C3848: ????"const com1"????????? const-volatile ??????"bool com1::operator ()(const first,const first)"
        VC\include\xtree(987) : ?????????"std::_Tree<_Traits>::_Nodeptr std::_Tree<_Traits>::_Lbound(const std::_Tree<_Traits>::key_type &) const"?
        with
        [
            _Traits=std::_Tmap_traits<first,second,com1,std::allocator<std::pair<const first,second>>,false>
        ]
        VC\include\map(77) : ??????????????"std::_Tree<_Traits>"???
        with
        [
            _Traits=std::_Tmap_traits<first,second,com1,std::allocator<std::pair<const first,second>>,false>
        ]
        0_0_5339909_21898.cpp(30) : ??????????????"std::map<_Kty,_Ty,_Pr>"???
        with
        [
            _Kty=first,
            _Ty=second,
            _Pr=com1
        ]