Help solve Error in Chain Search Query Helpers to Narrow Search Results

Tell us what’s happening:
This part of the code is giving error.
Question: Modify the queryChain function to find people who like the food specified by the variable named foodToSearch . Sort them by name , limit the results to two documents, and hide their age. Chain .find() , .sort() , .limit() , .select() , and then .exec() . Pass the done(err, data) callback to exec() .

From: MongoDB and Mongoose - Chain Search Query Helpers to Narrow Search Results

My code so far
Person.find({ favouriteFoods:foodToSearch })
.sort({ name: ‘asc’ })
.limit(2)
.select({ name:1,age: 0,favouriteFoods:1 })
.exec(function(err, data) {
//do something here
if (err) return console.error(err);
done(null,data);
});

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Challenge: Chain Search Query Helpers to Narrow Search Results

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