Comments by Amogs (Top 2 by date)

Thank you, What is in line 57 is this code below (from Controllers Instructor code, above) and that's what it is throwing as error:

// 1. Find user from db
let user = await User.findById(req.user._id).select('-password').exec();

And it is the "_id" from findById(req.user._id) that is throwing the error. I can't seem to understand why the error cos I had used it in another scenario to update database and no error was thrown. It successfully found the user by ID and updated it.
So I really can't get why this one is throwing an error.