error "required from here" in c++ [on hold]

Can anyone help me please,I tried so many things but couldn't solve this problem,I have a class named "trading" which has a method with this for loop, my code:

for(Iterator<House> it=Houses.begin();it!=Houses.end();++it){
    pair<House,double> HousePair;
    HousePair.first=(*it);
    HousePair.second=(*it).getPrice();
    (owner.getHousesMap()).insert(HousePair);
    }
}

*I can't post an image for the error i get. in the insert line I get this error: "required from here `std::pair,bool std::Rb_tree<_Key,Val,_KeyOfValue,_Compare,_Alloc>.....and so on.

*the method gets (List& Houses) *owner is of type class Ower and is a private parameter in the trading class