Query chaining with mongoose don't work

I am trying to pass the Chain Search Query Helpers to Narrow Search Results challenge but i fail. Here is my code

`const queryChain = (done) => {
const foodToSearch = “burrito”;

let chain = Person
.find({favoriteFoods:foodToSearch})
.sort({name : ‘asc’})
.limit(2)
.select({age : 0});

chain
.exec((err, data) => {
    done(err, data);
  })

};`

Does anyone see what is wrong?