Passport-facebook : 'cannot get /auth/facebook/callback?code= {callback_code} - node.js

Question

I'm incorporating Facebook authentication in my app using Passport with Node and Express, and MySQL db (using Bookshelf.js ORM). When I go to log in using Facebook, after entering my Facebook credentials, I get the error 'cannot get /auth/facebook/callback?code= {callback_code}'. I've tried the following solutions I found on stackoverflow: 1, 2, 3, 4
And this outside post: 5
None of these have worked.
In my FB app account, I've set 'Valid OAuth redirect URIs' inside of Client OAuth Settings to 'localhost:8080/auth/facebook/callback', App Domain to 'localhost', and Site URL to 'localhost:8080/'.
Below is my code. Any help is much appreciated!
Routes:
module.exports = function (apiRouter, passport) {
apiRouter.get('/events', isLoggedIn, eventController.getAllEvents);
apiRouter.post('/events', eventController.addEvent);
apiRouter.get('/auth/facebook', passport.authenticate('facebook', {scope : ['email ', 'public_profile', 'user_friends']}));
apiRouter.get('/auth/facebook/callback',
passport.authenticate('facebook', {failureRedirect: '/'}))
};
passport config:
passport.use(new FacebookStrategy({
clientID : configAuth.facebookAuth.clientID,
clientSecret : configAuth.facebookAuth.clientSecret,
callbackURL : 'http://localhost:8080/auth/facebook/callback'
},
function(token, refreshToken, profile, done) {
console.log('looking for user from fb');
process.nextTick(function() {
console.log('looking for user from fb inside async');
new User({ 'facebook_id' : profile.id })
.fetch()
.then(function(userModel) {
if (userModel) {
return userModel;
} else {
new User({
facebook_token: token,
first_name: profile.name.givenName,
last_name: profile.name.familyName
}).save()
.then(function(model) {
console.log('New user saved', model);
done(null, model);
},function(error) {
console.log('Error saving new user: ', error);
done(error);
});
}
done(null, userModel);
}, function(error) {
console.log('Error: ', error);
done(error);
});
});
}));